U.S. Air Force Senior Airman Charles Loeffler, 125th Fighter Wing crew chief, retrieves an oil sample for testing from an F-15 Eagle during the Trident Warrior exercise at Langley Air Force Base, Va., July 18, 2013. The Joint Tactical Information Distribution System will allow fourth and fifth-generation fighters to pass information freely for the first time. (U.S. Air Force photo by Staff Sgt. John D. Strong II / Released)