Second vote for "They were Expendable"! Found this on Wikipedia regarding co-star Robert Montgomery. I'd read somewhere he actually was involved with PT boats in the Pacific during WW2:
After the U.S. entered World War II in December 1941, he joined the United States Navy, rising to the rank of lieutenant commander, and served on the staff of the commander of Destroyer Squadrons 5 and 60; commanding officer PT-107; aboard the light cruiser USS Columbia; as an assistant naval attache at the U.S. Embassy, London; and as the executive officer of Motor Torpedo Boat 5 (PT-5).[citation needed][a] In 1945, Montgomery returned to Hollywood, co-starring and making his uncredited directing debut in They Were Expendable, where he directed some of the PT boat scenes when director John Ford was unable to work for health reasons.
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Operation Pacific, Sub movie with some real occurrences in it... Ward Bond is wounded topside and orders "Take her down" Commander Gilmore of the Growler actually did that to save the lives of his crew. The were a couple of impromptu Appendices operations on subs during the war...