The Piper-class was a type of tug starship in service to the Federation Starfleet in the 24th century. (Last Unicorn RPG module: The Price of Freedom)
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Presumably, a ship named USS Piper would be the prototype of this class, although such a vessel has yet to be mentioned. The two tug classes from the Last Unicorn Games RPG were the Piper-class and the Hogan-class, the two names together seem possibly intended to reference showy wrestling stars "Hulk" Hogan and "Rowdy Roddy" Piper.