This part applies to the Office of the Secretary of Defense (OSD), the Military Departments; the Chairman, Joint Chiefs of Staff and Joint Staff; the Unified and Specified Commands; the Inspector General of the Department of Defense (IG, DoD); the Defense Agencies; and the DoD Field Activities (hereafter referred to collectively as ``DoD Components''). The term ``Military Services,'' as used herein, refers to the Army, Navy, Air Force, and Marine Corps.