An Air Force F-22 Raptor aircraft assigned to Langley Air Force Base transits after refueling during exercise Red Flag at Nellis Air Force Base, Nev., July 18, 2016. This iteration of Red Flag specifically focused on multi-domain operations in air, space and cyberspace -- one of the future-war challenges areas that spurred the department to launch the recent Operational Challenges Crowdsourcing Initiative. Air Force photo by Tech. Sgt. David Salanitri