MEDAL PRESENTATION U.S. Army Gen Martin E. Dempsey, left, chairman of the Joint Chiefs of Staff, presents a Purple Heart medal to a U.S. service members on Forward Operating Base Azim Jan Karez, Afghanistan, Dec. 16, 2012. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 480238-Z-NIF25-583.jpg Photo Gallery