2-34. Baseline combat engineer units are focused on supporting combined arms operations at the tactical level. They are designed to provide close support to maneuver forces that are in close combat. All have the capability to fight as engineers or, if required, as infantry. An engineer battalion headquarters is typically included to provide the necessary mission command, logistics, and staff supervision for attached and assigned units when two or more are assigned to a BCT, an MEB, or another organization. Combat engineer (Sapper) units may construct tactical obstacles, defensive positions, and fixed and float bridges; repair CPs, LOCs, tactical routes, culverts, and fords; and conduct general engineering tasks related to horizontal and vertical construction, when augmented with appropriate tools, equipment, and training. Combat engineer units also provide engineer support for gap-crossing operations, assist in assaulting fortified positions, and conduct breaching operations. Airborne- and air assault-capable engineer units also have the unique ability to employ air-droppable, rapid runway repair kits to support forcible-entry operations. The more specialized combat engineering capabilities of assault bridging, breaching, and route and area clearance are added to the organic engineer capabilities in BCTs (or to deployed baseline Sapper companies) when required by the mission.

- https://www.globalsecurity.org/military/library/policy/army/... - page 271

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