The military is resuming flights of its tiltrotor V-22 Ospreys after ordering inspections of a gearbox to see which might be at risk of metal failure. (Mass Communication Specialist 3rd Class Amber Smalley/U.S. Navy)

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This art designed by Boeing shows one concept for the Air Force's future fighter, known as Next Generation Air Dominance. (Boeing)

Spc. Zachary Scarpetti of the 10th Mountain Division performs drone operator qualifications near Mihail Kogalniceanu Airbase, Romania. (Sgt Kourtney Nunnery/Army)

Outgoing Air Force Secretary Frank Kendall on Thursday downplayed Elon Musk’s recent pronouncements that crewed fighters are obsolete in the era of drones. (Anna Moneymaker/Getty Images)