IRAQ ARRIVAL U.S. Army Lt. Gen. Robert Caslen, right, commander of the U.S. Office of Security Cooperation in Iraq, and U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, talk while flying over Baghdad, Aug. 21, 2012. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 428115-C-UKF39-754.jpg Photo Gallery