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FM 3-22.91

Field Manual
No. 3-22.91
Department of the Army
Washington, DC, 17 July 2008

FM 3-22.91

Mortar Fire Direction Procedures

DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.


This manual provides guidance for military occupational specialty (MOS) 11C Soldiers and their trainers on the employment of the 60-mm mortars (M224), 81-mm mortar (M252), and 120-mm mortar (M120). It discusses the practical applications of ballistics and a system combining the principles, techniques, and procedures essential to the delivery of timely and accurate mortar fire. (See FM 3-22.90 for information about mechanical training, crew drills, and the characteristics, components, and technical data of each mortar.)

This manual is divided into six parts. Part 1 discusses the fundamentals of mortar fire direction; Part 2 summarizes the operational procedures of a fire direction center (FDC); Part 3 describes the capabilities and use of the mortar ballistic computer (MBC); Part 4 describes the capabilities and use of the M16/M19 plotting boards; Part 5 discusses the Mortar Fire Control System (MFCS); and Part 6 discusses the lightweight handheld mortar ballistic computer (LHMBC).

This manual was revised to delete references to obsolete material and systems and add references to new material and systems. In addition to various editorial corrections, this revision—

  • Removes all references to M2 and M19 mortar systems, as they are now obsolete.
  • Removes all references to M29 and M29A1 mortar systems, as they are now obsolete, except for M29A1 use with the M303 subcaliber insert.
  • Adds references to the LHMBC.
  • Replaces references to common terms with their accepted modifications.

This publication prescribes DA Form 2188-R (Data Sheet), DA Form 2188-1-R (LHMBC/MFCS Data Sheet), DA Form 2399-R (Computer’s Record), DA Form 5472-R (Computer's Record [MPI]), DA Form 2601-2-R (MET Data Correction Sheet 6400 Mils [Mortars]), and DA Form 2601-1-R (MET Data Correction Sheet for Mortars).

This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the US Army Reserve (USAR) unless otherwise stated. Terms that have joint or Army definitions are identified in both the glossary and the text. Terms for which FM 3-22.91 is the proponent FM are indicated with an asterisk in the glossary.

Uniforms depicted in this manual were drawn without camouflage for clarity of the illustration. Unless this publication states otherwise, masculine nouns and pronouns refer to both men and women.

The proponent for this publication is the US Army Training and Doctrine Command. The preparing agency is the US Army Infantry School. You may send comments and recommendations by any means (US mail, e-mail, fax, or telephone) as long as you use DA Form 2028 (Recommended Changes to Publications and Blank Forms) or follow its format. Point of contact information is as follows:

E-mail: benn.29IN.229-S3-DOC-LIT@conus.army.mil
Phone: Commercial: 706-545-8623
DSN: 835-8623
Fax: Commercial: 706-545-8600
DSN: 835-8600
US Mail: Commandant, USAIS
6650 Wilkin Drive, Bldg 74, Rm 102

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