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CHAPTER 2

Fundamentals of Engineer Operations


BATTLE COMMAND/C2

Command is truly an art and a science. Commanders are challenged to inspire soldiers in the most difficult of situations. Combat leadership requires a special blend of discipline, courage, and skill. Battle command¯

COMMAND AND SUPPORT RELATIONSHIPS

As a significant part of the tactical-planning process, the staff recommends the appropriate command or support relationship between engineer and maneuver units to the commander. Each situation is unique and requires its own solution. Whatever the relationship, engineer commanders are always responsible for the technical correctness of all tasks accomplished by their subordinate elements.

COMMAND

Command authority over engineer units is given to a maneuver commander when he requires immediately responsive engineers. This authority is well suited for fluid situations, such as exploitations and pursuits. The command relationship can be attachment, operational control (OPCON), or operational command (OPCOM).

Attachment

Attachment is recommended when¯

Operational Control

OPCON is appropriate when a subordinate maneuver commander needs task organization or direct-command authority over engineer units and the parent engineer HQ can provide continued logistical support. The parent engineer unit coordinates with logistics organizations to make this viable.

Operational Command

OPCOM is appropriate when an engineer unit supports another service in a joint operation. In this case, OPCOM is synonymous with OPCON concerning command, administrative, and logistical responsibilities. OPCOM may also be used for combined operations in the North Atlantic Treaty Organization (NATO).

SUPPORT

Command, administrative, and logistical responsibilities remain with the parent engineer unit in a support relationship. The engineer unit commander organizes the unit and suballocates tasks so that they will effectively meet the needs of the maneuver commander.

Direct Support (DS)

A DS relationship is appropriate when the subordinate maneuver commander needs a high degree of responsiveness from engineers but does not need task-organization authority. A higher HQ will often use this relationship when it anticipates a change to the engineer task organization that will require shifting engineer units to other locations. This relationship precludes further task organization of the engineer unit by the supported maneuver commander.

General Support (GS)

A GS relationship is appropriate when the higher HQ requires central control and flexibility in employing limited engineer forces. Engineers in the rear areas are usually employed in GS.

TASK ORGANIZATION

Engineer platoons work most efficiently under the control of an engineer company, and engineer companies work most efficiently under the control of an engineer battalion. This permits close control and the most productive use of all engineer assets. The engineer commander continuously monitors the progress of assigned tasks and shifts elements where the need is greatest throughout his AO.

The maneuver commander gets a better response when the engineer battalion, company, or platoon is under his direct control. He determines the task organization and gives missions directly to the engineer elements under his control. He gets quicker results but at the cost of decreased engineer flexibility to the higher maneuver commander.

Whether engineers are in a command or a support relationship to a maneuver HQ is a balance between the needs of the higher commander or the subordinate commander. The former needs engineers for flexibility and the most efficient use of scarce engineer assets. The latter needs engineers for responsiveness and the ability to task-organize his forces. Army operations doctrine requires subordinate commanders to seize the initiative whenever they can.

Normally, the corps commander provides each committed division with a corps combat-engineer group in a command relationship. Additional corps engineers are usually in a support relationship. The heavy division engineer brigade can then task-organize and provide adequate engineer support to its committed maneuver brigades while additional engineers accept missions in the division's rear. Divisions allocate engineers in DS to those brigades not in contact. For maneuver brigades already in contact, or when contact is imminent (maneuver commander flexibility is vital), the division should allocate engineer battalions in an attached or OPCON status. The brigade engineer, in turn, can provide engineers directly to his battalion task forces (TFs) only when he receives the engineers from the division in a command relationship. Otherwise, the engineer commander determines the deployment of his subordinate elements.

PERSPECTIVE:

Lieutenant Colonel Thomas Riggs, 81st Engineer Combat Battalion, received orders from the 106th Infantry Division to establish a line east of St Vith and hold off the Germans. He rounded up all available men of the 81st and 168th Engineer Combat Battalions and managed to hold off the Germans until 21 December when they broke up into small groups and attempted to make their way back to St Vith. Colonel Riggs was captured, but he escaped to Poland and fought with the Russians until he returned to his unit in April 1945.

CONTROL

A commander maintains control of subordinate elements directly by his presence at critical events and indirectly through his HQ. The first is an exercise in leadership, as described in FM 22-100. The second depends heavily on the commander's staff and organization, while also relying on his leadership.

The maneuver commander at each echelon uses his HQ to control combat operations, but he relies on engineer C2 elements to ensure that engineer units successfully execute the tasks that he assigns to them. Engineer C2 elements consist of the engineer member of the maneuver commander's battle staff, subordinate engineer unit commanders, and the staffs of those subordinate units.

USE OF ENGINEER HQ

Maneuver commanders assign the AOs for their subordinate units. Those same boundaries are also the basis for assigning AOs to engineers. When developing COAs in the tactical-planning process, the engineer planner allocates an available subordinate HQ to control engineer units. Whenever possible, the engineer planner aligns his operational boundaries with those of the maneuver forces, which is very important at the division level.

Commanders task-organize engineer units based on their estimate of the situation. An engineer company can command up to two additional engineer platoons. An engineer battalion can command up to five engineer companies. These can be a mixture of corps and divisional elements operating under either a corps or a divisional engineer HQ.

An engineer HQ often functions as a combined-arms HQ. An engineer platoon can incorporate tanks with mine plows for a breaching mission. An engineer company might be the breach force for a TF deliberate breach and have an attached tank platoon and attached mechanized infantry platoon. An engineer battalion might be the breach force for a brigade deliberate breach and have an attached tank/mechanized company/team plus air-defense assets. A division engineer brigade may have a special role in a major river-crossing operation and have attached to it a large number of military police, chemical, and intelligence units, as well as engineer units.

The engineer command (ENCOM) uses the theater contract construction agency (CCA) elements to provide contract construction and real estate operations. The CCA has area familiarity and habitual relationships within the theater and often maintains a forward presence in the area before contingency operations. USACE forward's (Fwd's) structure and capability are provided in theater. USACE may have a small HQ staff for controlling of one or more area offices and other dispersed teams while also maintaining communications to the parent HQ for technical and administrative support purposes.

Engineer Command

The ENCOM is a major subordinate command of the Army service component commander (ASCC) and provides C2 and a central organization framework for the operational-level engineer effort in theater. (Figure 2-1 shows a notional ASCC engineer theater laydown.) The ENCOM focuses on reinforcing and augmenting corps engineer efforts and developing the theater-support base. This focus involves planning, ensuring operational mobility, and coordinating all operational-engineering assets. It also involves command direction of topographic operations, construction, real-property maintenance activities (RPMA), LOC sustainment, engineer logistics management, and base development.

Theater-construction management often spans multiservice requirements. The unified or specified commander (commander in chief [CINC]) may direct establishing a regional contingency-engineering manager (RCEM) to control all theater-level engineering. The ENCOM can perform this role if the CINC designates the ASCC as the RCEM and the ASCC designates the ENCOM as its agent. An ENCOM may deploy by increments to meet highly variable work loads and situations.

Theater Army (TA) Engineer Brigade

The TA engineer brigade is the principal subordinate unit of the ENCOM. It commands and controls an engineer group HQ and engineer battalions, companies, detachments, and teams to meet varied operational-engineering requirements. The TA engineer brigade's AO normally coincides with the theater logistics command boundaries. The TA engineer brigade normally receives engineer work requests directly from the theater logistics command HQ and ENCOM. The TA engineer brigade's C2 capability is similar to the ENCOM's except for topographic-support functions.

Corps Engineer Brigade

The brigade staff aids the corps engineer in his roles of commander and special staff officer. The assistant corps engineer integrates engineers into the corps's plans. The rest of the engineer brigade staff completes the detailed planning necessary to implement the tasks assigned by the corps's order. The staff mainly acquires and positions resources needed for future operations. It is limited in coordinating the activities of the brigade's subordinate groups or battalions and in solving problems that hamper completing tasks critical to corps operations.

The brigade staff enables the commander to control engineer units in the corps's rear and sends resources forward to committed divisions, as needed. The brigade assigns portions of the corps's area to its subordinate engineer groups. These groups are positioned behind each committed division. Occasionally, the priority division may need a large number of corps engineers that an entire engineer group operates within the area. (See Figure 2-2 for a notional corps engineer brigade laydown.)

Engineer Group

The engineer group is responsible for the area that the brigade assigns. The engineer group is employed when the span of control, due to distances or numbers of engineer battalions, makes direct control by the brigade ineffective.

Division Engineer Brigade

As with the corps, the brigade staff aids the division engineer in his roles of commander and special staff officer. The assistant division engineer (ADE) integrates engineers into the division plan, and the remainder of the brigade staff does the detailed planning to support it. The brigade staff ensures that adequate administrative and logistical support is available for its engineer battalions. It solves logistics problems that prevent completing any critical engineer task within the division, whether performed by division or corps units. The brigade staff integrates engineers into rear operations.

Division Engineer Battalion

The engineer battalion HQ can control division or other corps units besides its own. The command or support relationship established in the division order determines how a battalion can employ engineer assets in its area.

When given to the brigade in a command relationship, the battalion HQ can be an engineer control HQ for a maneuver brigade. The priority maneuver brigade may have up to five engineer companies operating in its area. The battalion HQ gives the brigade the capability to fully use additional engineer assets effectively.

Engineer Company

The company is the lowest engineer echelon that can plan and execute 24-hour-a-day operations in support of maneuver forces. The company is ideally suited for integrating into maneuver TF operations. It provides the TF with an engineer HQ to provide C2 for organic and attached engineers and other units to execute engineer-oriented missions. The company also accomplishes brigade tasks independent of TF operations. For this, it is under the control of the engineer battalion.

Engineer Platoon

The engineer platoon is the lowest level that an engineer unit can still effectively accomplish independent tasks. For that reason, engineers rarely operate in smaller increments. If they do, it is for specific actions of limited duration. Usually, the platoon operates under the control of an engineer company; however, it can be placed in a command or support relationship to a maneuver company/team.

ENGINEER COORDINATION

Engineers often coordinate operations within an area by using area or task assignments. These supplement the command or support relationship; they are not a substitute.

Area Assignment

Engineers in a command or support relationship with a maneuver unit assume responsibility for that unit's AOs, unless the order states differently. The staff engineer at each echelon ensures that area responsibilities are clear. Wherever possible, area assignments follow maneuver unit boundaries in the combat zone (CZ) and the theater army area command (TAACOM) boundaries in the communications zone (COMMZ).

Task Assignment

Specific engineer units can have tasks that may or may not cross unit boundaries. Supply-route maintenance and pipeline construction are examples of coordination by task assignment.

ENGINEER INFORMATION FLOW

Accurate, timely information is vital to effective C2. Engineers use information of both an operational and a technical nature. They communicate through operations channels to keep their higher HQ informed on current missions and to plan future ones. Engineers communicate through engineer channels for technical information and as a way of passing operational information that is not time-sensitive. Unit standing operating procedures (SOPs) identify the type and frequency of reports needed at each echelon and the method for reporting.

Unit Status

Unit capabilities depend on the status of personnel, equipment, logistics, and training. Since these all fluctuate in the course of an operation, decision makers must have current information on hand. Maneuver commanders only need to know the engineer-unit status in broad terms. Engineer commanders and staff officers need detailed information to remedy specific deficiencies and make plans for a unit to execute them.

Mission Status

Operations do not always proceed exactly according to plan. Maneuver and engineer commanders need to know the progress of an operation. Engineers keep the immediate commander informed on critical tasks, such as reducing an enemy obstacle or emplacing a scatterable minefield. They also forward technical information upward and laterally for other engineers to take action.

Terrain Information

Engineers provide and analyze terrain information to assist in operational planning. They continuously update known information by all available means, especially from reports from subordinate engineer elements. Frequently, a proposed operation will generate engineer-specific requirements for specialized engineer reports, such as route or obstacle reconnaissance.

Army Battle Command System (ABCS)

The ABCS enables Army commanders to employ and sustain forces in the TO. It uses computer technology to disseminate and analyze information. Part of the system is the Army Tactical Command and Control System (ATCCS), which automates C2 functions at corps level and below. The Army Global Command and Control System (AGCCS) automates C2 functions at corps level and above. AGCCS and ATCCS overlap at corps level. Most combat-engineer automation under ABCS is a subfunction of the Maneuver Control System (MCS). Thus, engineer operations fall directly in line with maneuver-reporting requirements. Topographic-engineering automation is a subfunction of the intelligence and electronic warfare node. The Combat Terrain Information System (CTIS) interfaces with this node.

Control

Control is the process by which commanders employ or direct the combat power of assigned or supporting units. The authority to control is derived from command responsibility. Commanders exercise control by directing operational concepts, task organization, mission orders, graphic overlays, SOPs, control measures, and supply and other asset allocations to their staff and units. During operations, commanders exert control by activating preplanned situational responses, such as committing reserves or executing situational obstacles or by revising plans. Commanders must develop organizations so they can exert control from anywhere within the AO.

Control is a top-down process. The most important requirement is to establish a clear and precise concept of the operation based on an accurate estimate process. The concept must have¯

ROLES OF ENGINEER COMMANDERS AND STAFF ELEMENTS

Engineers at each echelon provide information, make routine decisions within the authority that the commander gives them, and perform staff supervision of engineer operations.

ASCC ENGINEER

The ASCC staff normally includes the ASCC engineer. He is a member of the ASCC commander's special staff. He integrates engineers into the ASCC's plan to sustain Army forces and support other services or allied forces. The senior operational-level engineer commander is the ASCC engineer.

CORPS ENGINEER

The commander of the corps engineer brigade is the corps engineer. He plans and executes engineer operations in the corps's area. As the engineer brigade commander, he commands all nondivisional engineer units in the corps. As the engineer special staff officer, he is responsible to the corps commander for all engineer-related matters in the corps's AO.

The brigade commander has a staff element located in the corps's command posts (CPs). This staff is under the direction of the assistant corps engineer, who integrates engineers into the corps's planning process. The assistant corps engineer provides advanced warning of future corps operations through engineer channels to the corps engineer brigade, division engineer brigade, separate brigades, and armored-cavalry-regiment (ACR) engineer companies. He receives reports from these levels to keep the corps staff informed on current engineer operations.

DIVISION ENGINEER

The commander of the division's organic engineer brigade or engineer battalion is the division engineer. He plans and executes engineer operations in the division area. The division order often gives control of the elements of the engineer brigade to the maneuver commanders, yet the division engineer retains his command responsibilities and employs those elements left under his direct control. As the engineer special staff officer, he is responsible to the division commander for all engineer-related matters in the division's AO. The division engineer remains so regardless of the rank of the senior corps engineer unit commander in the division's area. Corps engineer units in the division's area provide liaison to the division engineer.

To assist the commander in his role as a special staff officer, the division engineer has a staff element located in the division's CPs. It is under the direction of the ADE, who integrates engineer operations during the division's planning process. The ADE provides advanced warning, through engineer channels, of future division operations to the division and supporting corps engineer battalions and to the maneuver brigades. He also receives reports from these levels to keep the division staff and the corps engineer informed on current engineer operations in the division.

With the assistance of his staff, the division engineer controls corps units in the division area. The ADE passes division taskings to corps engineer units on behalf of the commanding general (CG).

BRIGADE ENGINEER

In an armored or mechanized division, the organic engineer brigade generally provides an engineer battalion to each ground-maneuver brigade. In a light, air-assault, or airborne division, the organic engineer battalion provides an engineer company to each maneuver brigade. The respective engineer battalion commander and company commander assume the brigade engineer responsibility. The brigade engineer integrates engineers into the brigade's planning process and coordinates current engineer operations in the brigade's area. As the brigade engineer, he commands all engineer units in the brigade. As the brigade engineer special staff officer, he is responsible to the brigade commander for all engineer-related matters in the brigade's AO. Separate maneuver brigades and ACRs have a staff engineer organic to the brigade or regiment.

BATTALION/TF ENGINEER

The brigade engineer often establishes a normal association between an engineer company and a maneuver battalion. Maintaining that association is one factor to consider in the tactical-planning process, since there are advantages to the company commander functioning as the TF engineer. The company commander normally associated with a battalion/TF is also the staff engineer and advisor to the task-force commander (TFC). The company commander has a small HQ section to assist the TFC in integrating engineers into the TF's planning process and in executing the engineer portion of the operation. He makes operational reports through the TF Operations and Training Officer (US Army) (S3) and provides other required reports through engineer channels, as necessary.

When additional engineers operate with the TF, the normally associated company commander remains the TF engineer. However, the other engineer unit commander and his staff assist in detailed planning.

ENGINEER ECHELON ARCHITECTURE

Strategic objectives, the nature of the TO, and the forces available influence the design of the theater commander's campaign plan. The requirements for engineers and the types of organizations, which come from this plan and drive the engineer architecture, vary from one theater to another. Organizational principles derived from Army operations guide the organization of engineers in the TO. These same principles apply to developing the engineer architecture at all echelons. (See Appendix A for types of engineer organizations.)

ORGANIZATIONAL PRINCIPLES

Through the tactical decision-making process and the engineer estimate, engineer commanders properly allocate forces to accomplish the engineer mission. The following principles provide a framework for commanders and staff officers to follow:

Task-Organize Engineer Forces to Requirements

Mission requirements drive the size and composition of engineer units. A mix of different units often is necessary to achieve the proper balance of capabilities. This mix can change as the operation progresses.

Give Priority to the Main Effort

The battlefield never has enough engineers to handle all tasks. They are not spread evenly but are concentrated to ensure the main effort's success. Because of this, risk can occur elsewhere. Engineers focus on the mission and not on habitually supporting a particular organization.

Integrate Engineers with Maneuver
and Fire

The scheme of maneuver governs the engineer plan. Fire, maneuver, and mobility/countermobility form a triad. Neither fire nor maneuver is truly effective if the combat formation cannot move at will and deny battlefield maneuver to the enemy. Engineers operate well forward in the CZ to integrate mobility/countermobility into the triad.

Ensure That Current Engineer Operations Promote Future Force Operations

Engineers must begin their work early to be done on time. They have to anticipate future missions and reposition their unit, if necessary, while accomplishing the current mission. Engineers not only have to accomplish the immediate mission but their services must also fit into the commander's long-term intent.

Do Not Hold Engineers in Reserve

Engineers organic to maneuver forces do not stay with those forces when they are held out of the fight. Engineers remain out of action only long enough to refit after a major action. Then they are committed in support of forward forces. Plans must ensure timely return before the parent maneuver force's commitment to combat to ensure adequate integration and preparation. (Engineer forces can be positioned to support reserve or counterattack forces or positioned in a follow-and-support role.)

Build a Logistically Sustainable Force

Resources are always limited. Material, transportation assets, and time restrict the engineer's ability to execute plans. Engineer-unit sustainment and the supporting logistics structure must be planned in detail. Logistics limitations may restrict the size of the usable engineer force.

Maintain Effective C2

Timely and accurate information is power. C2 facilities must function vertically and horizontally. Facilities must monitor and track combat operations and send accurate reports to the right person at the right time.

Use All Local Resources

Engineer resources belonging to local governments, other services, and allied forces are present in every theater. At the tactical level, improvising may be necessary to convert on-site materials and equipment to military use. At higher levels, HN resources are well suited for general-engineering support, especially in the rear areas. Local resources augment available engineers, releasing more engineer units forward to the CZ.

ORGANIZATION OF THE THEATER

Engineers operate throughout the theater. The numbers, types, and locations of engineer units in the organization reflect their intended missions. Combat-engineer units have missions in the CZ (division and corps areas). Combat battalions (heavy) have missions primarily in the COMMZ, corps's and division's rear areas, and sometimes in forward brigade areas. Separate engineer companies and teams have missions wherever their expertise is needed.

Engineers are always required in a TO. This force must be carefully tailored to its mission, well planned and well rehearsed. Contingency operations need a greater proportion of engineers than normal to support the force.

COMMUNICATIONS ZONE

The COMMZ provides the sustaining base for combat operations at the operational and tactical levels. The organization of engineer units in the COMMZ initially depends on the extent of TO construction (for base facilities and transportation networks) needed beyond those already available to support the operational commander. As the theater matures, the engineer organization changes, reflecting the need to maintain and repair those facilities and networks.

Requests for engineer missions pass from an area support group (ASG) to the engineer group in GS or from a TAACOM to the engineer brigade in GS. The engineer group or brigade assigns missions based on the priorities that the ASCC directs. Engineer units in the COMMZ execute the missions under control of the ENCOM structure. Only in an emergency might an ASG commander have OPCON of engineer units in his area to fight the rear-area threat.

Tactical Operations

The rear area is not safe from combat. Therefore, operational-level engineer units develop protective shelters and camouflage measures for support units and combat forces in the rear. The engineer units provide mobility/countermobility support to rear-area forces committed to destroying enemy insertions. They also assist in ADC.

Construction

New construction, maintenance, and repair work in the COMMZ sustain combat operations forward. The engineer brigades and groups plan, coordinate, and supervise this work. It includes roads, railways, pipelines, bridges, airfields, ports, buildings, utilities, and enemy prisoner of war (EPW) camps and installations.

Engineer combat battalions, heavy, have a variety of equipment, tools, and skills to do all types of construction. Some types, such as asphalt paving, require help from separate engineer companies and teams. Construction-support companies operate and maintain specialized construction equipment to augment the combat battalions, heavy.

Dump-truck companies provide additional haul assets. Pipeline-construction support companies provide technical personnel and special equipment to support pipeline construction and related facilities. Port-construction companies provide technical personnel and special equipment for constructing and restoring ports; logistics-over-the-shore (LOTS) facilities; inland waterway facilities; and petroleum, oils, and lubricants (POL) marine terminals.

Topographic Engineering

The theater topographic battalion HQ is located in the COMMZ, and will generally fall under the ENCOM if the ENCOM is in-theater. With the topographic planning-and-control team at the theater HQ, the topographic battalion coordinates with the HN and the Defense Mapping Agency (DMA) to fulfill theater requirements. The GS topographic company¯

Real-Property Maintenance Activities

The ASCC has overall responsibility for RPMA. The TAACOM, through its ASGs, normally provides the needed RPMA support. Principal RPMA functions in a TO include operation, repair, and maintenance of facilities and utilities; fire prevention and protection; and refuse collection and disposal. The logistics organization's RPMA requirements that exceed their capabilities are forwarded to the supporting engineer group for execution according to the theater priorities. The TAACOM provides technical RPMA guidance to the ASGs. ASGs provide RPMA support to all Army facilities in their AOs, to include leased facilities, unless host-nation support (HNS) is available for leased facilities.

Configuring engineer units to support the ASGs is based on the expected RPMA work load. They are tailored to the specific ASG that they will be supporting to accomplish RPMA missions.

RPMA may be administered on a centralized or decentralized basis. If decentralized, the TAACOM, through its ASGs, uses supporting engineer teams, USACE contracted RPMA engineering service, or HNS to accomplish it. ASGs have small cells to receive, prioritize, and coordinate engineer-support requirements. They assess work loads, sequence critical requirements, and request assistance from the engineer group in GS.

Many specialized engineer teams can be tailored to the needs of a particular ASG and support it under an engineer C2 HQ team. Except for the specialized teams assigned to the ASG, the engineer group has control of all engineer units in its assigned area. The ENCOM can also administer RPMA on a centralized basis. FM 5-116 contains more details on engineer operations in support of RPMA.

CORPS'S AREA

The corps generally fights at the tactical level of war; although, it may fight at the operational level during contingency operations. It has an engineer brigade assigned to it. The numbers and types of engineer units assigned to the brigade depend primarily on the mission of the corps, the numbers and types of their divisions and separate brigades, the enemy facing them, and the environment. Normally, each committed division of the corps will have with it elements of an engineer group from the corps engineer brigade. See FM 5-100-15 for more information on corps engineer operations.

TACTICAL OPERATIONS

Engineers have combat missions in all parts of the corps's area. Corps units operating in the forward part reinforce the division engineers. Many of the tasks performed by corps battalions in the corps's rear area are also done in the forward area while supporting the divisions.

In the corps's area, some of the missions are to provide guidance to units on protective shelters and camouflage measures. The major engineer commitment, however, is to keep the LOCs and tactical march routes open to sustain the committed forces, shift other forces, and implement corps-directed attacks. This requires continuous damage repair caused by enemy action, heavy traffic, and the weather.

Corps combat-engineer battalions perform most of these tasks. Combat-support equipment companies augment the combat battalions with equipment to move earth and maintain horizontal surfaces such as roads and airstrips. The combat battalions also assemble tactical bridges provided by panel-bridge companies or allocated from theater stocks for use on LOC and other routes. Medium-girder-bridge (MGB) companies erect their own tactical bridges.

The engineer brigade also has float-bridge assets for river-crossing operations. Ribbon-bridge (RB) companies transport, assemble, and operate ribbon rafts and bridges during river-crossing operations. Other float-bridge companies provide different types of bridging for longer-term use at the crossing sites. Combat battalions also assemble these float bridges.

The light corps combat battalions and the light-equipment companies reinforce the light division engineers, particularly during their initial deployment. The airborne corps battalion can parachute into an operational area and construct an assault airstrip. The light equipment company augments light forces with additional earth-moving equipment.

The separate brigades and the ACRs have an organic engineer company, which is usually not sufficient to handle all of the engineer tasks required when they are committed to combat. The corps engineer brigade reinforces these organizations and additional combat battalions and separate companies as determined by the mission and situation.

CONSTRUCTION

Construction activities occur throughout the theater and are not limited to the COMMZ. Within the corps's area, operational construction requirements, such as forward log bases, heliport,s and main supply routes (MSRs), are needed to ensure the continuity of support for combat operations. These activities are in addition to the corps-generated construction requirements (bed down, logistic bases, rehearsal ranges, and so forth) that keep corps construction assets fully engaged. The nature of corps operations limits construction to the essential facilities needed to sustain the current fight or to support near-term major operations.

To facilitate the forward focus of these corps engineer assets and to accomplish the myriad of tasks beyond the corps engineer's capabilities, operational-level engineers work within the corps's area. Control measures such as engineer work lines (EWLs) delineate areas of responsibility and are positioned as far forward as practical. EWLs are, therefore, independent of other boundary control measures, such as the corps's rear boundary, allowing operational-level engineers to concentrate on forward efforts critical to the close fight. Finally, the theater augments all its corps by assuming responsibility for specific support on a task basis forward to the EWL, again releasing corps construction units to engage in activities far forward and of immediate concern to the corps commander.

TOPOGRAPHIC ENGINEERING

A DS topographic company of the theater topographic battalion provides all forms of support for the corps. It is in the corps's rear area and provides a terrain-analysis team for the corps's CP.

REAL-PROPERTY MAINTENANCE

Utility teams supporting the corps support command (COSCOM) provide RPMA support in the corps's area. Additional support may be available through HNS, or the engineer brigade may assist with its combat battalions (heavy). The ENCOM provides additional support and technical guidance as necessary.

DIVISION AREA

The engineer infrastructure at the higher echelons makes it possible to commit and sustain divisions in combat. Divisions perform major tactical missions and can conduct sustained battles and engagements. The engineer forces organic to each division are tailored specifically to support that division. The corps engineer brigade provides additional engineer units based on the division's specific mission and tactical situation.

TACTICAL OPERATIONS

The division combat-engineer battalion is an element of the close combat fight. Corps combat battalions also participate in the division's close fight. Corps usually places at least one battalion in a command relationship to the division for this purpose. It fights well forward in the brigade's areas along with the division companies. Corps and division engineer elements often mix and cross-attach to enhance the relative strengths of each. The HQ of the normally associated corps engineer battalion often commands all engineers supporting a main effort brigade.

Each committed brigade normally needs the equivalent of an engineer battalion or one engineer company per battalion TF. This level of engineer support is adjusted based on the mission, enemy, terrain, troops, and time available (METT-T) analysis.

Additional corps battalions operate in the division on an area or task basis. Separate engineer companies, especially bridge companies, operate in the division as needed. When the division has the priority and need for a large contingent of corps engineers, it will often have an entire engineer group with it. When allocated to a division, the group HQ controls all engineer operations in the division's rear area. It allocates and controls engineer forces and resources for selected tasks in the maneuver brigade's areas. It may be a planning-and-control HQ for engineer tasks affecting the entire division, such as a divisional assault river crossing or a deliberate breach.

TOPOGRAPHIC ENGINEERING

The DS topographic company in the corps's area also provides a terrain-analysis team to the division. The team locates at the division's main HQ and works with the division's Assistant Chief of Staff, G2 (Intelligence) (G2) with input from the division engineer. See FM 5-105 for more information.




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