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U.S. Department of Defense > Pentagon Tours
The Pentagon - Wikipedia
U.S. Department of Defense
Pentagon History: 7 Big Things to Know - U.S. Department of Defense
Pentagon - Location, Building Timeline, 9/11 - HISTORY
Pentagon | History & Features | Britannica
PFPA | Visiting the Pentagon
Why Is the Pentagon a Pentagon? - Smithsonian Magazine
Pentagon summary | Britannica
What we know about the major Pentagon intelligence leak