The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, the "Pentagon" is often used metonymically to refer to the U.S. Department of Defense.
History
X-Men: Days of Future Past
The Pentagon is where Magneto was imprisoned for the murder of the President sometime before 1973 when he was freed by Wolverine, Professor X, Beast and Quicksilver to help find Mystique.
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