First Class

The oldest class of US subs to serve in a major combat role in the Pacific were the Tambor boats.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=5&t=19953
Very true. To put that in perspective, the 17 S boats that served in WWII are credited with a total of 42 sinkings (including sampans and junks) equaling about 130,000 tons. In comparison, the SS-193, USS Tautog, a member of the Tambor class, alone is credited with 26 sinkings totaling 72,000 tons. And the single ship record, if I remember correctly, is held by the USS Spearfish, SS-190, at 23 sinkings totaling 133,000 tons.