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In page USS Lykens (AT-56):

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In late 1921 the engines from the Navy’s four Lake Torpedo Boat-built N-class submarines were removed to be installed in more modern L-class submarines. In early 1922, Lykens got the call to tow three of the engineless subs from New London, Connecticut, to Philadelphia for decommissioning and scrapping. She towed N-7 in late January, N-6 in February, and N-5 in April.[7][8][9]