If it is in the air, maintenance put it there
U.S. Air Force Airman 1st Class Christopher Michael, an aircraft propulsion system apprentice with the 509th Aircraft Maintenance Squadron, puts on a fire shroud prior to an engine being installed on a B-2 Spirit at Whiteman Air Force Base, Mo., July 27, 2017. Aircraft propulsion system technicians dedicate hours to ensure all parts of the engine are working at optimal condition. (U.S. Air Force photo/Staff Sgt. Danielle Quilla)