Radar Picket Operations
After leaving the yard she resumed operations in the western Atlantic and in the fall of 1947 moved north for exercises with her sister radar picket submarine Spinax (SS-489); on 13 November she crossed the Arctic Circle. Given hull classification symbol SSR-481 on 20 January 1948, Requin began modification to the MIGRAINE II Radar Picket configuration at the Portsmouth Naval Shipyard in Kittery, Maine. In December she departed the shipyard after competing trials with new radar equipment and reported to New London, Connecticut for duty with Submarine Squadron 8.
In May 1949 she sailed east for her first deployment with the Sixth Fleet. Arriving at Gibraltar on 14 May, she operated in the Mediterranean Sea until 30 June. Soon after her return to New London, Requin was transferred to Norfolk, Virginia, for duty with SubRon 6. Into the spring of 1950, she operated in the western Atlantic, ranging from Nova Scotia to the West Indies. Overhaul occupied most of the summer, and with the end of the year she prepared for another Sixth Fleet tour. In the Mediterranean from mid-January to mid-May 1951, she resumed operations off the East Coast and in the Caribbean Sea on her return. In August 1952, she was back in European waters. During September, she visited the United Kingdom; then, in October the submarine transited the Strait of Gibraltar for her regular Sixth Fleet duty.
In 1953, she maintained her schedule of Second and Sixth Fleet operations, but at the end of the year put into Philadelphia, Pennsylvania, for an extensive modernization overhaul that among other changes removed her last antiaircraft cannon. On 2 May 1955, she sailed for her fifth Mediterranean deployment. Detached at the end of July, she returned to Norfolk and remained on the East Coast, with cruises to the Caribbean, until November 1957 when she resumed duty with the Sixth Fleet.
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