Captain George Hart of the Naval Regional Medical Center in Long Beach, California, became interested in HBO as early as 1967. He established monoplace chambers at that hospital while he was Chief of true pioneer in this field Davis, was Surgery. Although Hart, as we U s. Navy involvement with HBO remained isolated to the Beach facility and was not officially recognized. Aside from the work of Hart, who published extensively, the U.S. Navy has added relatively little to clinical hyperbarics