Tech. Sgt. Mathew Rupert and Master Sgt. Kevin Simmons, 911th Maintenance Squadron nondestructive inspection technicians, perform a daily process control to test the magnetic particle unit functionality at the Pittsburgh International Airport Air Reserve Station, Pa., Sept. 17, 2020. The magnetic particle unit is used to check for cracks on a variety of aircraft parts and ground equipment. (U.S. Air Force photo by Joshua J. Seybert)