Senior Airman Jacob Joyner, 5th Maintenance Squadron aircrafts fuel systems repair specialist, inspects sealant inside an external fuel tank trainer at Minot Air Force Base, N.D., Feb. 28 2018. The 5th MXS fuels systems repair shop, inspect and install aircraft fuel systems. (U.S. Air Force photo by Airman 1st Class Dillon J. Audit)