William Vincent O'Regan was a decorated submarine commander during World War II who reached the rank of Vice Admiral in the United States Navy.
Rear Adm. O'Regan with Fleet Adm. Nimitz in 1957
USS Thresher (SS-200) was the most decorated United States Navy submarine of World War II, with 15 battle stars and a Navy Unit Commendation. Thresher was the third of twelve Tambor-class submarines that were commissioned. All twelve fought in the war, and she was one of five to survive it.
Thresher as she appeared prewar, with hull number prominently displayed. Note also her conning tower has the large slab silhouette which would be rapidly reduced with wartime experience,
USS Thresher following refitting in the summer of 1943.