to being placed in inactive status. On 15 January 1946, Picuda was ordered to cease inactivation and report to the Second Fleet for duty as a unit of Submarine Division 81, Squadron 8, U.S. Atlantic Fleet.Picuda prepared for active service in the Portsmouth Naval Shipyard until 18 February and shifted to the Submarine Base at New London the next day. In company with five other submarines of the New London Group, she cleared that base 25 February for a tour of duty out of the Submarine Base at Balboa, Panama, returning by way of St. Thomas, to New London on 27 March. Picuda again entered the Portsmouth Naval Shipyard for inactivation on 27 March and was towed by a fleet tug to New London on 19 September 1946. She was placed out of commission, in reserve 25 September 1946.Picuda was assigned to the New London Group of the Atlantic Reserve Fleet until late in the year 1952 when she was towed to the Portsmouth Naval Shipyard for snorkel conversion. She recommissioned 19 June 1953, Lieutenant Commander Ted N. Swain . Her conversion was complete by 24 August and she shifted to the Submarine Base at New London. She reported for duty to Submarine Division 122, Squadron 12, U.S. Atlantic Fleet.Picuda steamed by way of Norfolk, Virginia, and Nassau, Bahamas, to arrive at Key West, Florida, on 17 September. She was assigned to duty as a training ship for Submarine Refit Training Group and based her operations for that command at Key West through September 1959. This duty included almost daily exercises in the Key West operating area, visits to American ports on the Gulf of Mexico, and periodic training cruises to the waters of Cuba, Jamaica and Haiti. This service was intervened by special cruises from Key West and two tours of duty in the Mediterranean Sea. On her first special cruise, she operated off Norfolk from 24 April to 20 May 1954, participating in anti-submarine development exercises. On her second special cruise, she cleared Key West on 3 September and set course for waters of Northern Europe and the Mediterranean. She arrived at Londonderry Port, Northern Ireland, on 24 September for joint maneuvers with ships of the Royal Navy, then arrived at Gibraltar on 29 October to join units of the Sixth Fleet for Operation "Bright Bonfire." She returned to Londonderry Port 14 November to resume hunter-killer and other