Field Manual (FM) 3-34.5/Marine Corps Reference Publication (MCRP) 4-11B establishes and explains the principles of environmental support in full spectrum operations and the ways in which United States Army and United States Marine Corps (USMC) commanders develop and implement command environmental programs. This manual supports the doctrine found in Joint Publication (JP) 3-34, FM 3-0, FM 3-34, and FM 3-34.170/Marine Corps Warfighting Publication (MCWP) 3-17.4. This manual provides guidance on integrating environmental considerations into the conduct of operations. It defines environmental considerations and provides guidance on their integration into the operations process. This manual also provides guidance on the development of command environmental programs and standing operating procedures (SOPs) to support operations and training. Terms that have joint or Army definitions are identified in both the glossary and the text. Glossary terms: The glossary lists most terms used in FM 3-34.5/MCRP 4-11B that have joint or Army definitions. Terms with an asterisk in the glossary indicate that this FM is the proponent FM (the authority). Text references: Definitions printed in boldface in the text indicate that this FM is the proponent FM. These terms and their definitions will be incorporated into the next revision of FM 1-02/MCRP 5-12A. For other definitions in the text, the term is italicized, and the number of the proponent FM follows the definition. Where the term "mission, enemy, terrain and weather, troops and support available, time available, civil considerations (METT-TC)" or "mission variables" is used, the USMC uses the term "mission, enemy, terrain and weather, troops and support available, time available (METT-T)." Civil considerations are inherently measured within the context of this acronym. The USMC title "environmental compliance officer" is generally the same as he Army term "environmental officer" as used throughout the manual. Unless this publication states otherwise, masculine pronouns do not refer exclusively to men. This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States, the United States Army Reserve (USAR), and USMC commanders and staffs, at all echelons of command, responsible for planning and executing operations. This doctrine applies to United States (U.S.) unilateral operations and U.S. Army and Marine Corps forces in multinational operations subject to applicable foreign nation laws and agreements.