Daniel Vincent Gallery was a rear admiral in the United States Navy. He saw extensive action during World War II, fighting U-boats during the Battle of the Atlantic, where his most notable achievement was the June 4, 1944 capture of the German submarine U-505. After the war, Gallery was a prolific author of fiction and non-fiction. During the post-war military cutbacks, he wrote a series of articles criticizing the heavy reductions being made to the US Navy. These articles placed him at odds with the administration during the episode which became known as the Revolt of the Admirals.

U-505 is a German Type IXC submarine built for Germany's Kriegsmarine during World War II. She was captured by the U.S. Navy on 4 June 1944.