428-GX-USN 1163602:   U.S. Naval School of Diving and Salvage, Washington Navy Yard, Washington, D.C.   A U.S. Navy man keeps close watch on the gauges 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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