The engineer support doctrine for the brigade combat team (BCT) is focused on tactical-level maneuvers. The engineer organizations organic to the BCT are optimized to perform combat engineering (primarily mobility with limited capabilities in countermobility and survivability) tasks with geospatial engineering support provided by the organic terrain teams. Additional engineering support (combat and general) comes from modular engineer organizations that are task-organized to the BCT or providing support from echelons above brigade (EAB) organizations. This manual is aligned with current BCT doctrine (see Field Manual FM] 3-90.6) and describes engineer support for the heavy brigade combat team (HBCT), infantry brigade combat team (IBCT), and Stryker brigade combat team (SBCT). Although the armored cavalry regiment (ACR) and its engineer company is not specifically addressed, the basic principles of this manual also apply to those organizations. This manual combines, updates, and supersedes material from the following four tactical-level engineer manuals: - FM 3-34.221. - FM 5-7-30. - FM 5-71-2. - FM 5-71-3. This manual is built directly on the doctrine contained in the following manuals: - FM 3-0. - FM 3-07. - FM 3-34. - FM 3-90. - FM 3-90.5. - FM 3-90.6. - FM 3-90.61. - FM 4-0. - FM 5-0. - FM 6-0. Given the magnitude of doctrinal changes in recent years, becoming familiar with these FMs is essential to effectively using this manual. This manual applies across the spectrum of conflict, from peacetime engagement to major combat operations. It is focused at the tactical level of war and meets the tactical commander's engineer support requirements. It is the tactical engineer commander's guide regarding the aspects of operations in support of the BCT and intended for use by brigade and below commanders and supporting staff (augmenting unit commanders, staffs supporting brigade and below maneuver organizations). This manual serves as a reference document for engineer commanders, staff, leaders, training developers, and doctrine developers throughout the Army. It is a primary manual for instructional purposes within the U.S. Army Engineer School (USAES) and assists other Army branch schools in teaching the integration of engineer capabilities into Army operations, since engineer involvement is a given for nearly every military operation. This manual includes guidance on integrating organic and augmenting engineer forces into BCT tactical plans, orders production, and mission execution. It incorporates the use of essential tasks for mobility, countermobility, and survivability (M/CM/S) in BCT operations and highlights the organic and likely engineer augmentation to the BCT as it operates across the spectrum of conflict. - Chapter 1 describes engineer roles in support of the BCT and includes considerations for operating in the operational environment (OE). - Chapter 2 focuses on the integration of engineer operations during planning and the command and control (C2) of engineer forces during execution. - Chapter 3 describes engineer support to operations and the integration of engineer reconnaissance. - Chapter 4 focuses on the varying levels and types of engineer support for each form of security operations performed by the BCT. - Chapter 5 describes the targeting process and engineer involvement in planning lethal and nonlethal fires in the BCT. - Chapter 6 describes how the modular engineer force provides specialized capabilities to meet the needs of the BCT during offensive and defensive operations. - Chapter 7 provides an overview of and discusses some of the associated engineer tasks and special considerations for each. - Chapter 8 focuses on sustainment support for engineer operations within the BCT. This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated.