A U-2 Dragon Lady taxis down the flightline at Osan Air Base, Republic of Korea, Dec. 11, 2018. As the U-2 taxis, takes off and lands on the flightline, a second U-2 pilot normally chases behind in a high-performance vehicle, assisting the pilot by providing radio inputs for runway and altitude alignment. (U.S. Air Force photo by Staff Sgt. Sergio A. Gamboa)