Field Manual FM 3-34 Engineer Operations December 2025

This United States Army publication, Field Manual FM 3-34 Engineer Operations December 2025, is the Army doctrinal publication that contains the foundational doctrinal guidance for U.S. Army engineers. This manual is the integrating publication that nests engineer doctrine with Army capstone / keystone doctrine and joint doctrine. It focuses on synchronizing and coordinating the diverse range of capabilities in the Engineer Regiment to support the Army and its mission successfully. Subordinate engineer doctrinal publications are based on the foundations established in this manual and are aligned with their respective joint and Army publications. FM 3-34 provides operational guidance for engineer commanders and trainers at all echelons and forms the foundation for the United States Army Engineer School curricula.

To comprehend the doctrine contained in this manual, readers should understand the fundamentals of operations and the Army’s operational concept, multidomain operations. Readers of this manual should also understand the Army profession and moral principles, the fundamentals of the operations process, the principles of mission command, and the protection principles.

The principal audience for FM 3-34 is the commanders and staff elements at all echelons and the engineer personnel who are tasked with planning, directing, and executing engineer missions. Trainers, educators, and combat developers throughout the Army also benefit from using this manual.