Staff Sgt. James Dillard (right), 512th Logistics Readiness Squadron fuels specialist, observes how a civilian contractor follows U.S. Navy de-fueling procedures April 25, 2018 at Joint Base Pearl Harbor-Hickam, Hawaii. During his annual tour at the joint base, Dillard gained hands-on experience operating equipment he normally doesn’t see at Dover Air Force Base, Del., like an overfill prevention system known as a Scully System. (U.S. Air Force photo by Staff Sgt. Joe Yanik)