Field Manual 3-21.8

Field Manual 3-21.8
Name	Field Manual 3-21.8
Caption	U.S. Army manual on rifle and automatic rifle marksmanship and squad tactics
Author	United States Army
Country	United States
Language	English
Subject	Small unit tactics, marksmanship
Publisher	U.S. Army Training and Doctrine Command
Pub date	2000s–2010s
Pages	various

Field Manual 3-21.8 Field Manual 3-21.8 is a United States Army doctrinal publication addressing infantry marksmanship, squad-level tactics, and weapons employment. It synthesizes guidance used by units assigned to United States Army Training and Doctrine Command, integrates lessons from operations in Iraq War, War in Afghanistan (2001–2021), and references historical practice from conflicts such as the Vietnam War and Operation Desert Storm. The manual has been promulgated to standardize training across formations including 82nd Airborne Division, 1st Infantry Division, and 101st Airborne Division.

Overview

The manual provides doctrinal parameters for individual and collective tasks performed by infantry soldiers in units like the Infantry Regiment, Ranger Regiment, and light infantry brigades. It aligns with doctrine promulgated by United States Army Combined Arms Center and supports institutional schools such as the United States Military Academy, United States Army Infantry School, and Airborne School. Topics include marksmanship, fire control, movement techniques, and immediate action drills referenced by commanders in units from III Corps to United States Army Europe.

History and Publication

Development was led by subject-matter experts drawn from organizations including the U.S. Army Training and Doctrine Command, Fort Benning, and combat-experienced leaders from units like 3rd Infantry Division and 10th Mountain Division. Revisions followed combat lessons from Battle of Fallujah, Siege of Kandahar, and other engagements, and incorporated feedback from institutions such as the Institute of Land Warfare and veteran advisors from the National Infantry Association. Publication cycles intersected with revisions to manuals like those issued by United States Department of Defense and standards set by the Joint Chiefs of Staff.

Contents and Organization

Chapters are organized to cover weapon systems, marksmanship fundamentals, firing positions, sighting systems, and squad-level maneuver techniques used by formations like 1st Special Forces Command and 75th Ranger Regiment. Appendices include tables, ballistic data, and training schedules referenced by schools such as Fort Moore and professional education at Joint Readiness Training Center. The manual cross-references procedures from legacy doctrine tied to documents influenced by leaders associated with General George S. Patton, General Dwight D. Eisenhower, and modern proponents in United States Army Forces Command.

Tactics and Techniques Covered

It details immediate action drills, fire and maneuver techniques, battle drills, and weapons employment for systems including the M16 rifle, M4 carbine, and squad automatic weapons used by Stryker Brigade Combat Team elements. Movement techniques reference practices used in operations by units such as the Marine Expeditionary Unit and allied forces like British Army infantry. The manual outlines close engagement drills comparable to those practiced during Operation Iraqi Freedom and defensive measures reminiscent of engagements in the Kunduz Province.

Training and Implementation

Implementation occurred through institutional training at centers including the United States Army Noncommissioned Officer Academy, Fort Polk, and rotational exercises at the National Training Center (Fort Irwin). Noncommissioned officers from units such as 1st Cavalry Division and advisors from the U.S. Special Operations Command integrated the manual into unit standard operating procedures and mission-essential task lists submitted to higher echelons like FORSCOM.

Criticism and Controversy

Critics from think tanks such as the Center for Strategic and International Studies and commentators in publications tied to institutions like Harvard University and Brookings Institution argued the manual sometimes emphasized legacy techniques at odds with emerging technologies like advanced optics from manufacturers paralleled by procurement decisions in the Defense Logistics Agency. Debates mirrored discussions involving doctrine reform in the aftermath of Operation Enduring Freedom and were cited by analysts linked to RAND Corporation.

Legacy and Influence=

The manual influenced allied doctrine within organizations including the North Atlantic Treaty Organization and training syllabi at institutions like the United Kingdom Ministry of Defence and Canadian Armed Forces. Its procedures informed subsequent doctrine updates and field guides used by units from U.S. Army Pacific to multinational forces during exercises such as Operation Atlantic Resolve and shaped education at professional schools like the U.S. Army War College.

Category:United States Army publications