Royal Jordanian air force 1st Lt. Mehrem Khaled locates leaks in a fuel chamber during a 361st Training Squadron aircraft fuel systems course at Sheppard Air Force Base, Texas, Sept. 28, 2018. To find the leaks, Khaled blows pressurized air in the area where it could be located while his wingman watches for air bubbles from the inside. Khaled graduated the class Oct. 1. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)