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  2. United States Department of Defense - Wikipedia

    en.wikipedia.org/wiki/United_States_Department...

    That is the funding for the Department of Defense, split between $617 billion in base and $69 billion in overseas contingency". [48] The Department of Defense budget encompasses the majority of the National Defense Budget of approximately $716.0 billion in discretionary spending and $10.8 billion in mandatory spending for a $726.8 billion total.

  3. United States federal executive departments - Wikipedia

    en.wikipedia.org/wiki/United_States_federal...

    Department of Defense (as executive department) became and still are military departments within the Department of Defense: Secretary of the Army: Gordon Gray: Air Force: Secretary of the Air Force: Stuart Symington: Navy: April 30, 1798 August 10, 1949 Department of Defense (as executive department) became and still is a military department ...

  4. List of U.S. Department of Defense agencies - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._Department_of...

    The department was established in 1947 and is currently divided into three major Departments—the Department of the Army, Navy and Air Force—and has a military staff of 1,418,542 (553,044 US Army; 329,304 US Navy; 202,786 US Marine Corps; 333,408 US Air Force). [1]

  5. United States Department of the Navy - Wikipedia

    en.wikipedia.org/wiki/United_States_Department...

    The United States Department of the Navy (DON) is one of the three military departments within the Department of Defense of the United States of America.It was established by an Act of Congress on 30 April 1798, at the urging of Secretary of War James McHenry, to provide a government organizational structure to the United States Navy (USN). [1]

  6. History of the United States Air Force - Wikipedia

    en.wikipedia.org/wiki/History_of_the_United...

    The USAF, along with the U.S. Navy, later patrolled the skies of northern and southern Iraq after the war to ensure that Ba'athist Iraq's air defense capability could not be rebuilt: Operation Provide Comfort 1991–96 and Operation Northern Watch 1997–2003 – no-fly zones north of the 36th parallel north and Operation Southern Watch – no ...

  7. United States Department of Homeland Security - Wikipedia

    en.wikipedia.org/wiki/United_States_Department...

    Whereas the Department of Defense is charged with military actions abroad, the Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism. [19]

  8. The Pentagon - Wikipedia

    en.wikipedia.org/wiki/The_Pentagon

    The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II.

  9. Military history of the United States - Wikipedia

    en.wikipedia.org/wiki/Military_history_of_the...

    The National Security Act of 1947, meeting the need for a military reorganization to complement the U.S. superpower role, combined and replaced the former Department of the Navy and War Department with a single cabinet-level Department of Defense.