If it is in the air, maintenance put it there
A B-2 Spirit engine is inspected before being installed at Whiteman Air Force Base, Mo., July 27, 2017. Each B-2 engine has a thrust of 17,300 pounds, which allows the aircraft to reach high subsonic speed to be anywhere on the globe within a short amount of time. (U.S. Air Force photo/Staff Sgt. Danielle Quilla)