Airman 1st Class Christopher Rich, 5th MXS aircraft structural maintenance apprentice, vacuums an upper engine cowling at Minot Air Force Base, N.D., Jan. 25, 2018. Airmen with the 5th MXS aircraft structural maintenance shop are trained to restore B-52H Stratofortress’ structural integrity to ensure they are safe and mission ready. (U.S. Air Force photo by Airman 1st Class Jonathan McElderry)