'SCREECH' SHAKE Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, shakes hands with Screech, the mascot of the Washington Nationals, before a game between the Nationals and Milwaukee Brewers at Nationals Park in Washington, D.C., July 4, 2013. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 835552-J-MSJ64-189.jpg Photo Gallery