U.S. Air Force Airman 1st Class Jerod Rice, 20th Equipment Maintenance Squadron nondestructive inspection apprentice, uses a blacklight to search for flaws in the structural integrity of a halo at Shaw Air Force Base, S.C., Feb. 13, 2018. Halos function as engine stands, propping up aircraft engines to be maintained and tested. (U.S. Air Force photo by Senior Airman Destinee Sweeney)