Master Sgt. Tristan McIntire, 40th Flight Test Squadron, marshals the F-15EX, the Air Force’s newest fighter aircraft, to a stop at Eglin Air Force Base, Fla. March 11, 2021. The F-15EX will be the first Air Force aircraft to be tested and fielded from beginning to end through combined developmental and operational tests. (U.S. Air Force photo by Samuel King Jr.)