U.S. Air Force Staff Sgt. Robert Smith cleans an M2 .50-caliber machine gun at Bagram Airfield, Afghanistan, July 21, 2015. Smith, a maintainer assigned to the 455th Expeditionary Aircraft Maintenance Squadron, HH-60 Pave Hawk helicopter, and works to keep the Pave Hawks armed so that the combat rescue mission in Afghanistan is successful. U.S. Air Force Staff Sgt. Robert Smith cleans an M2 .50-caliber machine gun at Bagram Airfield, Afghanistan, July 21, 2015. Smith, a maintainer assigned to the 455th Expeditionary Aircraft Maintenance Squadron, HH-60 Pave Hawk helicopter, and works to keep the Pave Hawks armed so that the combat rescue mission in Afghanistan is successful. SHARE: Download: Full Size (1.896903 MB) Tags: Photo Essays Credit: VIRIN: 492813-K-XCM23-379.jpg Photo Gallery