ANTHEM VOICES Army Gen. Martin E. Dempsey, center, chairman of the Joint Chiefs of Staff, sings the national anthem with members of the Army chorus before a game between the Washington Nationals and Milwaukee Brewers at Nationals Park in Washington, D.C., July 4, 2013. Following the game, Dempsey posted a Facebook message, including the video of his performance, in honor of Independence Day. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 450777-I-KJG19-106.jpg Photo Gallery