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.
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ComSubLant also oversaw Submarine Squadron 22 at La Maddalena in the Mediterranean, which existed 1972-2008 and was known as Submarine Refit and Training Group La Maddalena from 1972 to the mid-1980s.