It also trains and equips required forces for airborne operations and doctrines, procedures, and equipment of interest to the Marine Corps for airborne operations not provided by the Army. Collateral Functions of the Navy and Marine Corps The collateral functions of the Navy and the Marine Corps are to train forces to do the following: Restrain enemy land and air power and communications through operations at sea Conduct close air and naval support for land operations Furnish aerial photography for carto- graphic purposes Participate in the overall air effort, when directed Set up a military government, as directed, pending transfer of this responsibility to other authority DEPARTMENT OF THE AIR FORCE The primary responsibility of the Department of the Air Force is to prepare the Air Force, as necessary,  for  war.   It is also responsible for expanding peacetime components of the Air Force to meet the needs of war. The Air Force, within the Department of the Air Force, includes both combat and service aviation forces. Primary Functions of the Department of as the Air Force The primary functions of the Air Force are follows: To organize, train, and equip Air Force personnel to conduct prompt and sustained combat operations in the air. Specifically, the Air Force defends the United States against air attack. The functions of the Air Force support the doctrines set up by the JCS. These doctrines include gaining and maintaining general air supremacy, defeat- ing enemy air forces, controlling vital air areas, and setting up local air superiority. 1-7 To develop doctrines and procedures, in coordination  with  other  U.S.  military services, for the unified defense of the United States against air attack. To organize, train, and equip Air Force personnel for strategic air warfare. To organize, train, and equip Air Force personnel  for  joint  amphibious  and airborne operations in coordination with other U.S. military services. To  furnish  close  combat  and  logistical air support to the Army. This air sup- port includes airlift, support, and re- supply  of  airborne  operations;  aerial photography; tactical reconnaissance; and restraint of enemy land power and com- munications. To provide air transport for the armed forces. To develop, in coordination with other U.S. military services, doctrines, pro- cedures, and equipment for air defense from land areas, including the continental United States. To formulate doctrines and procedures for organizing, equipping, training, and em- ploying Air Force troops. To  provide  an  organization  capable  of furnishing adequate, timely, and reliable intelligence for the Air Force. To furnish aerial photography for carto- graphic purposes. To  develop  tactics,  techniques,  and equipment for amphibious operations in coordination  with  other  U.S.  military services. To develop doctrines, procedures, and equipment employed by Air Force troops in airborne operations with other U.S. military services.