The United States studied the German Type XXI and used the information to modify WW2 fleet boats with the GUPPY program.
Two GUPPY-type submarines were an interim measure until new submarines being built in Europe became available.
After a further exchange of correspondence, Submarine Forces Atlantic established Submarine Development Group 2, consisting of four diesel submarines, two Guppy (Greater Underwater Propulsion Power Program) conversions and two standard fleet boats.
The Greater Underwater Propulsion Power Program (GUPPY) would be initiated because of the results of these tests.
The Tang class submarines were a product of the Greater Underwater Propulsion Power Program (GUPPY), which incorporated German U-boat technology into the United States Navy's submarine design.
Some of the class were updated through the GUPPY (The Greater Underwater Propulsion Power Program).
In the early 1970s, many navies began to need replacements for pre-WWII submarines, aging United States GUPPY conversions, and British units transferred postwar.
The Type XXI design directly influenced advanced post-war submarines, the GUPPY improvements to the American Gato, Balao, and Tench class submarines and the Soviet submarine projects designated by NATO as the Whiskey and Zulu classes.
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