Fourth and fifth-generation aircraft from the U.S. Air Force, French air force and Royal air force fly in a training airspace during ATLANTIC TRIDENT 17 near Joint Base Langley-Eustis, Va., April 26, 2017. The F-35 Lightning II was incorporated in the exercise, along with the F-22 Raptor and fourth-generation assets to develop tactics, techniques and procedures that can be used during future coalition fights. (U.S. Air Force photo/Staff Sgt. Natasha Stannard)