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  2. The agency was originally established as the Defense Investigative Service and was created on January 1, 1972. [2] In 1999, the agency changed its name to the Defense Security Service. [ 3 ] In July 2019, DSS was reorganized as DCSA, in conjunction with the transfer of responsibility for conducting background investigations from OPM 's National ...

  3. 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.

  4. United States Secretary of Defense - Wikipedia

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

    Department of Defense Directive 5100.01 describes the organizational relationships within the department and is the foundational issuance for delineating the major functions of the department. The latest version, signed by former secretary of defense Robert Gates in December 2010, is the first major re-write since 1987.

  5. United States security clearance - Wikipedia

    en.wikipedia.org/wiki/United_States_security...

    The Defense Counterintelligence and Security Agency is the primary security agency [39] that conducts background investigations for the Federal Government, conducting 95% of all background investigations for over 100 agencies and conducting approximately 2 million background investigations each year. [citation needed]

  6. 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]

  7. Yankee White - Wikipedia

    en.wikipedia.org/wiki/Yankee_White

    Yankee White is an administrative nickname for a background check undertaken in the United States of America for Department of Defense personnel and contractor employees working with the president and vice president. [1]

  8. Defense Intelligence Agency - Wikipedia

    en.wikipedia.org/wiki/Defense_Intelligence_Agency

    The Defense Intelligence Agency (DIA) is an intelligence agency and combat support agency of the United States Department of Defense, specializing in defense and military intelligence. A component of the Department of Defense (DoD) and the Intelligence Community (IC), DIA informs national civilian and defense policymakers about the military ...

  9. 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 ...