United States Department of Defense, and associated, civil affairs are civil-military operations (CMO) use of military force to control areas seized from the enemy (or a third party), minimize insurgency or civil interference with military operations, and maximize civil support for military operations. CMO is conducted in conjunction with combat operations during wartime and becomes a central part of a military campaign in counter-insurgencies. CMO operations have been in frequent use since 1775 by the United States Army, as well as more recently by the Navy and Marine Corps.