Staff Sgt. Robert Jackson and Bulgarian air force Master Sgt. Vladimir Kolev discuss the differences and similarities in maintainance procedures for their planes April 2 at Graf Ignatievo Air Base, Bulgaria. As part of a familiarization program, a few Airmen from each country's service were allowed to tour and learn about each other's aircraft. Sergeant Jackson is deployed here as part of Operation Noble Endeavor. Sergeant Jackson, an F-15 Eagle crew chief, is deployed for Operation Noble Endeavor. Sergeant Kolev is a MiG-29 crew chief. (U.S. Air Force photo/Tech. Sgt. Jill LaVoie)