Take a look behind the lens at the missions and accomplishments of the men and women who serve in the U.S. armed forces. The Department of Defense provides the military forces needed to deter war...

The Pentagon, one of the world's largest office buildings, is the headquarters of the Department of Defense. Located in the Washington, D.C., area, the five-sided building has three times the...

Why is the Pentagon actually a pentagon? And is it the biggest office building in the world? Find these answers and more in the 10 things you probably didn't know about the Pentagon.

Learn how to register, access, and tour the Pentagon, the headquarters of the Department of Defense. Find out the requirements, restrictions, and prohibited items for visiting the Pentagon as a sponsor or a visitor.

Pentagon, large five-sided building in Arlington county, Virginia, near Washington, D.C., that serves as the headquarters of the U.S. Department of Defense, including all three military services— Army, Navy, and Air Force.

Learn about the Pentagon, the headquarters of the U.S. Department of Defense, and its construction, role and significance in American history. Find out how it was built, what happened on 9/11 and how it changed after the attacks.

Learn about the origins, functions, and symbolism of the Pentagon, the headquarters of the U.S. Department of Defense. Explore the historical records, publications, and programs of the Historical Office of OSD.

Explore the history and significance of the Pentagon, the headquarters of the U.S. Department of Defense, through this self-guided tour brochure. Learn about the art, artifacts and memorials that honor the military, the Constitution and the 9/11 victims.

Pentagon officials are holding informal discussions about how the Department of Defense would respond if Donald Trump issues orders to deploy active-duty troops domestically and fire large swaths ...