Got this from one of the website posted above...
Quote:
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The Mk.28 was a 21" x 246", 20 knot, submarine launched anti-surface vessel torpedo with a 585 lb warhead. It was equipped with passive homing and gyroscopic control which competed for rudder control. About 1750 of these torpedoes were produced by Westinghouse and Western Electric. Only fourteen were fired with four hits during WW II, but the torpedo remained in service until 1960.
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I'm guessing that the devs felt it was under-utilized and didn't make any real difference in the war. Probably same thinking that caused them to leave out the Tench boats from the game.