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  2. United States Department of Defense - Wikipedia

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

    The United States Department of Defense (DoD, [2] USDOD, or DOD) is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the U.S. government directly related to national security and the United States Armed Forces.

  3. Organizational structure of the United States Department of ...

    en.wikipedia.org/wiki/Organizational_structure...

    The President of the United States is, according to the Constitution, the Commander-in-Chief of the U.S. Armed Forces and Chief Executive of the Federal Government. The Secretary of Defense is the "Principal Assistant to the President in all matters relating to the Department of Defense", and is vested with statutory authority (10 U.S.C. § 113) to lead the Department and all of its component ...

  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 Secretary of Defense - Wikipedia

    en.wikipedia.org/wiki/United_States_Secretary_of...

    The Department of Defense is composed of the Office of the Secretary of Defense (OSD), the Joint Chiefs of Staff (JCS) and the Joint Staff (JS), Office of the Inspector General (DODIG), the Combatant Commands, the Military Departments (Department of the Army (DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense ...

  6. 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 ...

  7. Ministry of defence - Wikipedia

    en.wikipedia.org/wiki/Ministry_of_defence

    Building of Russian Ministry of Defence at Frunzenskaya Embankment. Moscow, Russia. A ministry of defence or defense (see spelling differences), also known as a department of defence or defense, is the part of a government responsible for matters of defence and military forces, found in states where the government is divided into ministries or departments.

  8. Office of the Secretary of Defense - Wikipedia

    en.wikipedia.org/wiki/Office_of_the_Secretary_of...

    The Office of the Secretary of Defense (OSD) is a headquarters-level staff of the United States Department of Defense.It is the principal civilian staff element of the U.S. Secretary of Defense, and it assists the Secretary in carrying out authority, direction and control of the Department of Defense in the exercise of policy development, planning, resource management, fiscal, and program ...

  9. List of Department of Defense appointments by Joe Biden

    en.wikipedia.org/wiki/List_of_Department_of...

    Assistant to the Secretary of Defense for Public Affairs. Chris Meagher: September 9, 2022 — John Kirby [4] January 20, 2021 May 27, 2022 Appointed to the National Security Council as coordinator for strategic communications [5] — Department of Defense Press Secretary. Patrick S. Ryder [6] August 4, 2022 — — Chief of Staff to the ...