The Department of Defense was founded on August 10, 1949
James Mattis is the Head of the Department of Defense (Jan. 20th)
Department of Defense Seal
The Secretary of Defense is the principal defense policy advisor to the President. Under the direction of the President, the Secretary exercises authority, direction, and control over the Department of Defense. The Deputy Secretary, the second-highest ranking official in the DoD, is delegated full power and authority to act for the Secretary and to exercise the powers of the Secretary on any and all matters for which the Secretary is authorized to act.Today, the Department, headed by Secretary of Defense Jim Mattis, is not only in charge of the military, but it also employs a civilian force of thousands. With over 1.3 million men and women on active duty, and 742,000 civilian personnel, we are the nation's largest employer. Another 826 thousand serve in the National Guard and Reserve forces. More than 2 million military retirees and their family members receive benefits.