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US Department of Defense (Formerly the War Department): 1. US Army (land warfare) 2. US Marine Corps (amphibious & land warfare) 3. US Navy (sea/ocean & in Vietnam, Riverine Warfare) 4. US Air Force (Airpower) US Department of Homeland Security (Formerly the Department of the Treasury, Formerly the Department of Transportation): 5. US Coast Guard (Law Enforcement on the seas/rescue operations)

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16y ago

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