U.S. Army Pvt. Brent Bates, a student assigned to the Maritime Intermodal Training Department watercraft operator course, hammers wedges into a rupture during a simulation exercise at Fort Eustis, Va., Jan. 26, 2016. The wedges were used to stop water from bursting through the ruptures during the damage control tank simulator training. . (U.S. Air Force photo by Staff Sgt. Natasha Stannard)