My grandfather died when I was fairly young. I've been meaning to start a project about both my grandafther's military service. I have one grandfather still alive and am currently building my interview for him. However, all I have for my late paternal grandfather is his military file jacket (which is very incomplete) and the name of the submarine he was on circa 1945. The USS Croaker. Wikipedia was fairly helpful. What other sources could I reference for ship manifests and possible records and locations of his sub. I've asked my grandma and unfortunately she was rather unhelpful (just because she didn't know all to much about his time on board). Any help appreciated.