She was acquired by the Navy from the Maritime Administration on 15 September 1954 and reclassified YAGR-4 in August 1954. She was converted to a radar picket ship at the Charleston Naval Shipyard, Charleston, South Carolina, and commissioned Searcher on 2 April 1955.[5][4]
Searcher departed Charleston, 16 May 1955, for Newport, Rhode Island, where, after shakedown, she reported for duty with the seaward extension of America's early warning defense system. She reported on station for her first patrol on 5 July 1955.[5]
Fitted with sophisticated electronic search and tracking equipment, Searcher could locate, track, and report enemy aircraft at great distances, and control high-speed interceptor aircraft in event of an attack. She also carried out weather reporting duties during her three-to-four-week-long cruises.[5]
On 13 November 1955, Searcher was damaged by an engine room fire which burned for six and a half hours before being extinguished with the aid of two other ships. Her patrols were otherwise uneventful. She was reclassified AGR-4 effective 28 September 1958; and, during the Cuban Missile Crisis in 1962, she operated at sea for 60 out of 67 days.[5]
In March 1964 she lost her screw at sea while steaming in a heavy gale 450 miles ESE of Cape Cod and was later taken in tow first by the US Coast Guard Cutter Yakutat and then by a US Navy tug.[6]