Migraine III SSR Conversion - Radar Picket
By this time, the Cold War with the Soviet Union was in full swing, and air defense of U.S. carrier battle groups on potential strike missions near the Russian landmass generated a requirement for even more submarine radar pickets.
Eventually, six more World War II submarines – all Manitowac-built USS Gato (SS-212)-class boats – were chosen for the more drastic MIGRAINE III SSR conversion. Because experience had shown that even the newer SSR configurations were seriously cramped, the final MIGRAINE design called for cutting the boats in two and inserting a 24-foot “plug” to get additional room for an expanded CIC and electronic spaces forward of the main control room. Even so, the MIGRAINE IIIs also had to sacrifice their after torpedo tubes for more berthing space, but they were fitted with a larger, streamlined sail, with the BPS-2 search radar mounted aft of the periscopes and other masts. An AN/BPS-3 height-finder radar on a pedestal just behind the sail and an AN/URN-3 TACAN beacon on the afterdeck completed the installation. The six MIGRAINE III boats were all converted at the Philadelphia Navy Yard between 1951 and 1953 – giving the Navy a total of ten radar picket submarines to face the growing Soviet threat just as the Korean War was drawing to a close.
The Rock keel was laid down 23 December 1942, at Manitowoc Shipbuilding Co., Manitowoc, WI.; Launched, 20 June 1943; Commissioned 26 October 1943; Decommissioned, 1 May 1946, at New London, CT.; Laid up in the Atlantic Reserve Fleet.
In early 1951 Rock was towed from New London to the Philadelphia Naval Shipyard, where she was converted to a radar picket submarine by bisecting her at the forward bulkhead of the control room and inserting a 30-foot (9 m) section between the control room and the forward battery to house the new CIC and the majority of her new electronic equipment. Reclassified (SSR-274) on 18 July 1952, Rock recommissioned at Philadelphia 12 October 1953.
Rock was reclassified to an Auxiliary general submarine (AGSS-274), 1959–1969
On 13 September 1969, Rock decommissioned at Puget Sound Naval Shipyard. Struck from the Navy List on the same day, she was designated for use as a target for destruction.
341' 6” length
6 x 21” TT Bow