U.S. Army Spc. David Plummer, a second class diver with the 569th Engineer Dive Detachment, rescues Sgt. Gordon Yeaple, a salvage diver and noncommissioned officer in charge with the 569th Engineer Dive Detachment, during a Salvage Dive Rodeo training at Fort Eustis, Va., March 18, 2016. The rodeo is a yearly upgrade training event that allows divers to accomplish tasks that they were not introduced to in the field. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)

U.S. Soldiers check Sgt. Gordon Yeaple, a salvage diver and noncommissioned officer in charge with the 569th Engineer Dive Detachment, during a Salvage Dive Rodeo training at Fort Eustis, Va., March 18, 2016. Yeaple’s simulated taking on bad air during a dive and was rendered unconscious for the purposes of the upgrade task training exercise. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)

A U.S. Army diver conducts an equipment safety check before a fellow diver with the 569th Engineer Dive Detachment goes into the water at Fort Eustis, Va., March 18, 2016. Safety checks are conducted on all equipment before each dive to mitigate any possible risk. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)

U.S. Army safety divers with the 569th Engineer Dive Detachment stand-by as Sgt. Gordon Yeaple, a salvage diver and noncommissioned officer in charge with the 569th Engineer Dive Det., dives into the James River at Fort Eustis, Va., March 18, 2016. As part of a yearly training, Yeaple simulated being unconscious due to breathing in too much carbon monoxide, so that the safety swimmer could complete a rescue task to upgrade his proficiency as a diver. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)

U.S. Army Sgt. Gordon Yeaple, a salvage diver and noncommissioned officer in charge with the 569th Engineer Dive Detachment, prepares to dive during a Salvage Dive Rodeo training at Fort Eustis, Va., March 18, 2016. Before and during the dive, the Soldiers practice safety checks on the equipment and divers to ensure tasks are completed without risking the lives. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)

U.S. Army Sgt. Gordon Yeaple, a salvage diver and noncommissioned officer in charge with the 569th Engineer Dive Detachment, signals to the safety and stand-by divers that he is going down at Fort Eustis, Va., March 18, 2016. The divers use hand signals and rope-line pulls to communicate their status and needs as verbal communication is not possible during a dive. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)