My father served on a WW2 era sub, the USS Cavallla, when the Korean War ended. When he met my mother he resigned his commission so he could marry her.
Sometime in the early-mid 1960s we were living in Connecticut and driving back from a trip to Mystic Seaport when my father suddenly realized he still had his old Navy pass, and wondered if it still worked. Well, we turned off I-95 at Groton and pulled up to the Navy Base gate there and sure enough, it got us in. My father began telling my sister and I what everything was .... then he stopped, surprised, as the sub pens. The sub he'd served on was there. Moreover, the commander was an old navy buddy who'd stayed on.
So my mother, my sister and I all got the 25¢ tour of what then was still an active diesel electric sub, built during WW2 as a Gato class (thin-skin) and refitted in 1953 with a new sail, new hydrophones as a "hunter-killer" type. As a kid I was impressed with the tiny space the crew had to deal with. It was nothing like in the old WW2 movies....where they needed to have room for a camera & lighting equipment, of course!
Sorry to see these WW2 old timers go. My father didn't serve in WW2, he was still in Annapolis, but the USS Cavalla was credited with sinking one of the Japanese carriers used in the attack on Pearl Harbor.