Department Chair: Lloyd J. Austin III

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:

Department of Defense Military Intelligence

Uniformed Services University of the Health Sciences

United States Army Pamphlets

U.S. Air Force Research

U.S. Army Administrative Publications

US Army Corps of Engineers

U.S. Army Field Manuals

US Army Research

U.S. Army Technical Manuals

U.S. Army Training Documents

U.S. Navy Research