This United States Army field manual, Army Techniques Publication ATP 3-34.22 Engineer Operations – Brigade Combat Team and Below April 2021, provides a doctrinal foundation for the conduct of engineer operations in support of unified land operations, focused on tactical maneuvers at the brigade combat team (BCT) level and below. The engineer organizations organic to the BCT are optimized to perform combat engineering tasks (primarily mobility with limited capabilities in countermobility and survivability), with geospatial engineering teams providing organic capability. Additional engineering support (combat and general) comes from engineer organizations that are task-organized to the BCT or that provide support from echelons above brigade (EAB) organizations. This manual is aligned with current BCT doctrine (see FM 3-96) and describes engineer support for the armored brigade combat team (ABCT), infantry brigade combat team (IBCT), and Stryker brigade combat team (SBCT). Although the security force assistance BCT and its respective engineer battalions are not addressed in detail, the basic principles of this manual also apply to those organizations. The principal audience for ATP 3-34.22 consists of commanders, officers, noncommissioned officers (NCOs), and staff at the BCT level and below as well as EAB units that support BCTs. ATP 3-34.22 is a primary manual for instructional purposes within the United States Army Engineer School and assists other Army branch schools in teaching the integration of engineer capabilities into Army operations. ATP 3-34.22 applies to the Active Army, Army National Guard/Army National Guard of the United States and United States Army Reserve unless otherwise stated.