This part applies to:

(a) the Office of the Secretary of Defense, the Military Departments (including the Coast Guard at all times, including when it is a Service in the Department of Homeland Security by agreement with that Department), the Office of the Chairman of the Joint Chiefs of Staff and the Joint Staff, the Combatant Commands, the Office of the Inspector General of the Department of Defense, the Defense Agencies, the DoD Field Activities, and all other organizational entities within the DoD (hereinafter referred to collectively as the “DoD Components”).

(b) The Commissioned Corps of the U.S. Public Health Service (USPHS), under agreement with the Department of Health and Human Services, and the National Oceanic and Atmospheric Administration (NOAA), under agreement with the Department of Commerce.