428-GX-USN 1163596:   U.S. Naval School of Diving and Salvage, Washington Navy Yard, Washington, D.C.   Two divers are ready for a dive during the Naval School of Diving and open sea helium and oxygen training dives.   Photographed by PH1 (DV) S.L. Waterman, July 1975.  U.S. Navy Photograph, now in the collections of the National Archives.  (2016/06/14).
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