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This picture taken 26 December 2011 shows the Pentagon building in Washington, DC.  The Pentagon, which is the headquarters of the United States Department of Defense (DOD), is the world's largest office building by floor area, with about 6,500,000 sq ft (600,000 m2), of which 3,700,000 sq ft (340,000 m2) are used as offices.  Approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel work in the Pentagon. AFP PHOTO (Photo credit should read STAFF/AFP/Getty Images) AFP-Getty Images