CLOSE SUPERVISION U.S. Air Force Master Sgt. Eric Marshall monitors an Afghan National Air Corps airman firing a PKM general-purpose machine gun in an Mi-17 Hip helicopter, May 12, 2008, over Kabul, Afghanistan. Marshall is assigned to the Combined Air Power Transition Force and is deployed from the 18th Air Maintenance Squadron, Kadena Air Force Base, Japan. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 110145-Q-CYN39-896.jpg Photo Gallery