Department Chair: Chuck Hagel

The mission of the Department of Defense is to provide the military forces needed to deter war and to protect the security of the United States of America. The department's headquarters is at the Pentagon.

Browse the U.S. Department of Defense Collections:

DOD Military Intelligence

Uniformed Services University of the Health Sciences

U.S. Air Force Research

US Army Corps of Engineers, Omaha District

US Army Research

U.S. Army Training Documents

U.S. Navy Research