<P> The Pentagon is the headquarters of the United States Department of Defense , located in Arlington County , Virginia , across the Potomac River from Washington , D.C. As a symbol of the U.S. military , The Pentagon is often used metonymically to refer to the U.S. Department of Defense . </P>
<P> The Pentagon is the headquarters of the United States Department of Defense , located in Arlington County , Virginia , across the Potomac River from Washington , D.C. As a symbol of the U.S. military , The Pentagon is often used metonymically to refer to the U.S. Department of Defense . </P>
what is the pentagon in washington dc used for
what is the pentagon in washington dc used for
headquarters of the United States Department of Defense
headquarters of the United States Department of Defense