Question: Whose picture did Dodge salute in his cabin when he said "live to fight another day"?
Answer: Looks like Mush Morton, but that wasn't his ship. The real name of the submarine used in the movie was the Pampanito (SS-383). Her captain was Charles Jackson. It might be his picture on the wall. I can't find a picture of him.
Answer: Dodge says "We live to fight another day, Captain." suggesting that the photo is of the previous captain of the Stingray.