The United States Department of Defense, occasionally referred as DOD, is an executive branch department of the United States of America. Beneath it are many subordinate departments, including the Departments of the Army, Navy, and Air Force, the Defense Advanced Research Projects Agency, the National Security Agency, and the National Reconnaissance Office.
In the 1950s, Department of Defense appointed Gerald Sharpe to work with S.H.I.E.L.D. and oversee the Project Helius, although he came to the conclusion that the project was pointless since there was no possible power source for the Ion Fusion Reactor.
In 2014, Natasha Romanoff attended a Department of Defense committee meeting that included Scudder, Wenham, Bryant, and Sandell. Wenham wanted her imprisoned for the crimes she had committed in her past, but ultimately did not get his way.