Army Techniques Publication ATP 3-34.40 (FM 3-34.400) MCWP 3-17.7 General Engineering February 2015 General Engineering provides doctrine for the conduct of GE support by the U.S. Army and U.S. Marine Corps. It emphasizes the GE unity of effort by providing a common philosophy, language, and purpose. GE is a joint function and a U.S. Army discipline. This manual discusses how GE enables commanders to achieve their objectives in supporting joint and U.S. Army operations. This publication also introduces subordinate doctrine. This revision of the December 2008, Army-only FM 3-34.400 (now obsolete) makes this manual a multi-Service publication with the U.S. Marine Corps. This manual builds on the collective knowledge, wisdom, and military expertise gained through recent operations, numerous lessons learned, and doctrine revisions. This doctrine has also been adjusted to reduce the duplication of technical detail already contained in the referenced subordinate manuals. This publication describes how engineer commanders, staffs, and subordinate leaders conduct GE to support U.S. Army and Marine forces within the framework of joint operations.