U.S. Air Force Senior Airman Maverick Shuler, 380th Expeditionary Maintenance Squadron nondestructive inspection specialist, waits as an oil sample is tested inside the Jet Oil Analysis Program unit at Al Dhafra Air Base, United Arab Emirates, August 2, 2021. Shuler used the JOAP unit to determine the levels of different metals in the oil. (U.S. Air Force photo by Staff Sgt. Jao’Torey Johnson)