National security act amendments of 1949 : hearing before the Committee on Armed Services, United States Senate, Eighty-first Congress, first session, on S. 1269 and S. 1843, a bill to convert the National Military Establishment into an executive department of the Government to be known as the Department of Defense; to provide the Secretary of Defense with appropriate responsibility and authority, and with civilian and military assistance adequate to fulfill his enlarged responsibility; and for other purposes.