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An armed officer who said he is with the Department of Defense, works near the gate at the Washington Navy Yard, closed to all but essential personnel, in Washington, on Tuesday, Sept. 17, 2013, the day after a gunman launched an attack inside the Washington Navy Yard on Monday, spraying gunfire on office workers in the cafeteria and in the hallways at the heavily secured military installation in the heart of the nation's capital. (AP Photo/Jacquelyn Martin)
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