Staff Sgt. John-Moses Robinson, 86th Aircraft Maintenance Squadron defensive systems technician, from Ramstein Air Base, Germany, moves an engine maintenance stand off the flight line during Operation Thracian Fall 2011, Oct. 18, 2011 in Plovdiv, Bulgaria. Thracian Fall is an off-station training exercise designed to enhance interoperability between U.S. and Bulgarian Air Forces as well as build partnerships with paratroopers from both. (U.S. Air Force photo/Senior Airman Stephen J. Otero)