Coast Guard Rear Adm. John Nadeau in a KM-37 surface supplied diving helmet, at Naval Diving and Salvage Training Center in Panama City, Fla., July 9, 2015. Nadeau visited the NDSTC and performed a familiarization dive with Coast Guard Divers in the Aquatic Training Facility. (U.S. Coast Guard photo by DV1 Michael Garst)