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 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.