M1151 HMMWV Expanded Capacity Armament Carrier
M1151A1 HMMWV Expanded Capacity Armament Carrier IAP/Armor Ready
M1151P1 HMMWV Expanded Capacity Armament Carrier IAP/Armor Ready
The M1151 HMMWV was an improved armament carrier configuration of the HMMWV family. The M1151 HMMWV had the heavier chassis and improved engine of the M1113 Expanded Capacity Vehicle, which enabled it to use of removable add-on armor protection that provided the Army greater flexibility when deploying units. The M1151 was standard with the basic armor package of earlier generation HMMWVs, but was designed to accept the various armor packages developed to bring it to a similar level of protection to that of an Up-Armored HMMWV.
The M1151 HMMWV was a lightweight, high performance, four-wheel drive, air transportable and air droppable, tactical wheeled vehicle. The vehicle had a diesel engine, automatic transmission and payload capacity of a 2,300 pounds. Fully-loaded M1151 armament carriers could climb road grades as steep as 40 percent (22 degrees) and traverse a side slope of up to 30 percent (13.5 degrees). The vehicles could ford hard bottom water crossings up to 30 inches (76 centimeters) without a deep water fording kit and 60 inches (152 centimeters) with the kit. For higher payload capacity, the M1151 was equipped with a reinforced frame, crossmemebers, lifting shackles, heavy-duty variable rate rear springs, shock absorbers, reinforced control arms, heavy-duty tires and rims, and a transfer case and differential with a modified gear ratio. The optional front self-recovery winch also permited recovery operations of similar vehicles.
The M1151 was intended to replace the US Army's M1025A2 armament carriers and the US Marine Corps' M1043A2 armament carriers. It was also designed to provide an alternative to the M1114 Up-Armored HMMWV in use by both organizations. Like the M1114, the M1151 were fully capable of accepting various armor kits. The M1151 Expanded Capacity Armament Carrier provided mounting and firing of the Mk 19 Mod 3 automatic grenade launcher, M2, caliber, .50 machine gun, M60 and M240 7.62mm machine guns, and M249 5.56mm Squad Assault Weapon (SAW). The weapons were ring-mounted with a 360 degree arc of fire, with armor protection for crew, weapon components, and ammunition.
The Army relied on the US Marine Corps HMMWV requirements to maintain an affordable production rate. The Army's initial XM1151's were required to support the Army's Modularity and Brigade Combat Teams (BCT) units. Also, HMMWV's weare required for Data Interchange Programs development and fielding of critical Combat Support and Combat Service Support Systems such as Advanced Field Artillery Tactical Data System (AFATDS), Secure Mobile Anti-Jam Reliable Tactical Terminal (SMART-T) and Tactical Unmanned Aerial Vehicle (TUAV). Some of these HMMWV's were to be provided to integrating Project Managers to support meeting critical milestones in standing up the Stryker Brigade Combat Teams. The XM1151 was used to support the Ranger's Ground Mobility Systems, as well as the Knight program, ARNG Division Redesign Study (ADRS) and other Army Interchange requirements. Vehicles were to be placed in high priority units.
While the M1151 was designed to be able to integrate the Perimeter Armor of the M1114 and the various Fragmentary Armor Kits (Frag Kits) developed for the HMMWV family, it was not supplied as such. A variant with the Integrated Armor Protection (IAP) package installed at the factory, including underbody armor, rocker armor, lower windscreen deflector armor and energy absorbing seats was developed, initially designated the M1151P1. The designation for these Armor Ready vehicles was later changed to M1151A1. This nomenclature change reflected the US Army's Long Term Armor Strategy of developing vehicles with adaptable armor packages. These vehicles could be fitted with a default A-Kit armor package, with the option of addition B-Kit packages offering added protection. The B-Kit for armament carrier HMMWVs, known as the B1 kit, included perimeter armor, overhead armor, and rear ballistic bulkhead, bringing the vehicle up to a similar level of protection as the M1114. Frag Kits could also be installed.
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