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field headquarters, forces, reserve components, installations, activities, and functions under the control or supervision of the Secretary of the department. When used with respect to the Department of Defense, it means the executive part of the department, including the executive parts of the military departments, and all field headquarters, forces, reserve components, installations, activities, and functions under the control or supervision of the Secretary of Defense, including those of the military departments. (6) "Executive part of the department" means the executive part of the Department of Defense, Department of the Army, Department of the Navy, or Department of the Air Force, as the case may be, at the seat of government. (7) "Military departments" means the Department of the Army, the Department of the Navy, and the Department of the Air Force. (8) "Secretary concerned" means— (A) the Secretary of the Army, with respect to mattera concerning the Army; (B) the Secretary of the Navy, with respect to matters concerning the Navy, the Marine Corps, and the Coast Guard when it is operating as a service in the Navy; (C) the Secretary of the Air Force, with respect to matters concerning the Air Force; and (D) the Secretary of the Treasury, with respect to matters concerning the Coast Guard when it is not operating as a service in the Navy. (9) "National Guard" means the Army National Guard and the Air National Guard. (10) "Army National Guard" means that part of the organized militia of the several States and Territories, Puerto Rico, the Canal Zone, and the District of Columbia, active and inactive, that— (A) is a land force; (B) is trained, and has its officers appointed, under the sixteenth clause of section 8, article I, of the Constitution; (C) is organized, armed, and equipped wholly or partly at Federal expense; and (D) is federally recognized. (11) "Army National Guard of the United States" means the reserve component of the Army all of whose members are members of the Army National Guard. (12) "Air National Guard" means that part of the organized militia of the several States and Territories, Puerto Rico, the Canal Zone, and the District of Columbia, active and inactive, that— (A) is an air force; (B) is trained, and has its officers appointed, under the sixteenth clause of section 8, article I, of the Constitution; (C) is organized, armed, and equipped wholly or partly at Federal expense; and (D) is federally recognized.
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