MCRP 3-15.2A Mortars.pdf

MCRP 3-15.2A

FM 23-90

Mortars

U.S. Marine Corps

PCN 144 000100 00

PREFACE

This publication prescribes guidance for leaders and crewmen of mortar squads and

platoons. It is concerned with the problems of mortar crew training. It presents practical

solutions to assist in the timely delivery of accurate mortar fires but does not discuss all

possible situations. Local requirements may dictate minor variations from the methods

and techniques described herein. However, principles should not be violated by

modification of techniques and methods.

The scope of this publication includes mortar crew training at squad and section levels.

The 60-mm mortar, M224; 81-mm mortar, M29A1; 81-mm mortar, M252; 4.2-inch (107-

mm) mortar, M30; and 120-mm mortar, M120, are discussed herein to include

nomenclature, sighting, equipment, characteristics, capabilities, ammunition, and

maintenance.

Note: For clarity and simplicity, the artwork in this manual does not show soldiers in

BDUs. The words and required art detail cannot be seen due to the camouflage

on BDUs.

The provisions of this publication are the subject of international agreements:

QSTAG 900 Characteristics of a Multirole Mortar Fuze (Edition One)

STANAG

2321

NATO Code of Colors for the Identification of Ammunition

(Except Ammunition of a Caliber Below 22 millimeters)

The proponent of this manual is HQ TRADOC. Submit changes for improving this

publication on DA Form 2028 (Recommended Changes to Publications and Blank

Forms) and forward it to US Army Infantry School, ATTN: ATSH-INB-O, Fort

Benning, GA 31905-5594.

Unless otherwise stated, whenever the masculine gender is used, both men and women

are included.

FM 23-90

TECHNICAL ORDER 11W2-5-13-21

1 MARCH 2000

By Order of the Secretary of the Army:

ERIC K. SHINSEKI

General, United States

Army

Chief of Staff

Official:

Administrative Assistant to

the

Secretary of the Army

0000505

DISTRIBUTION: Active Army, Army National Guard, and U.S. Army Reserve : To be

distributed in accordance with the initial distribution number 110209, requirements for

FM 23-90.

*FM 23-90/TO 11W2-5-13-21

FIELD MANUAL

NO. 23-90

TECHNICAL ORDER

NO. 11W2-5-13-21

HEADQUARTERS

DEPARTMENT OF THE ARMY

AND THE AIR FORCE

WASHINGTON, DC, 1 March 2000

FM 23-90

MCRP 3-15.2A

MORTARS

Table of Contents

PREFACE

CHAPTER 1 INTRODUCTION

Section I General Doctrine

1-1. Effective Mortar Fire

1-2. Mortar Positions

Section II Indirect Fire Team

1-3. Applications

1-4. Team Mission

Section III Safety Procedures

1-5. Duties of the Safety Officer and Supervisory Personnel

1-6. Ammunition Care and Handling

1-7. Field Storage of Ammunition

CHAPTER 2 SIGHTING AND FIRE CONTROL EQUIPMENT

Section

I Compass, M2

2-1. Characteristics

2-2. Description

2-3. Use

Section

II Aiming Circles, M2 and M2A2

2-4. Characteristics

2-5. Description

2-6. Use

2-7. Accessory Equipment

2-8. Setup and Leveling of Aiming Circle

2-9. Declination Constant

2-10. Orienting of the Instrument on Grid North to Measure Grid

Azimuth to Objects

2-11. Measurement of Horizontal Angle Between Two Points

2-12. Orienting of the 0-3200 Line on a Given Grid Azimuth

2-13. Orienting of the 0-3200 Line on a Given Magnetic Azimuth

2-14. Verifying the Lay of the Platoon

2-15. Orienting by Orienting Angle

2-16. Disassembly of Aiming Circle

2-17. Care and Maintenance

Section

III Sightunits

2-18. Sightunit, M53-Series

2-19. Operation of M53 Sightunit

2-20. Care and Maintenance of M53 Sightunit

2-21. Sightunit, M64-Series

2-22. Sightunit, M67

Section

IV Boresights

2-23. Boresight, M45-Series

2-24. Boresight, M115

2-25. Principles of Operation

2-26. Installation

2-27. Sight Calibration

2-28. Boresight Method of Calibration

2-29. Calibration for Deflection Using the M2 Aiming Circle

Section

V Other Equipment

2-30. Instrument Light, M53E1

2-31. Aiming Posts, M14 and M1A2

2-32. Aiming Post Lights, M58 and M59

Section

VI Laying the Section

2-33. Reciprocal Laying

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