Dexter was recommissioned on 30 June 1958 and assigned to a new home port, Alameda, California.
 She departed Curtis Bay on 14 July 1958 under the command of Commander Bainbridge Leland, USCG.

Dexter arrived at Alameda on 11 August 1958.
She assumed duty as the United States West Coast training ship for the United States Coast Guard Reserve training component.
 She provided training at sea for Coast Guard Reserve recruits undergoing training at Alameda Training Station.
 Manned by a complement of 83—eight officers, 10 chief petty officers, and 65 other enlisted men—to 85, Dexter had facilities for handling over 100 recruits at a time.
 Recruits spent approximately three months aboard Dexter for indoctrination and one extended cruise beyond the waters of San Francisco Bay.
Dexter also made cruises to various ports on the U.S. West Coast, as well as to British Columbia in Canada, Hawaii, Alaska, and Mexico, in connection with training activities.

Dexter also participated as a search-and-rescue patrol vessel for various sailing races and regattas, including the September 1958 America's Cup Race at Newport, Rhode Island, and the Transpacific Yacht Races from Los Angeles, California, to Honolulu, Hawaii, of 1959, 1961, and 1965.

Dexter also conducted search and rescue operations.
 On 18 July 1959, she towed the disabled fishing vessel Cloud Nine until relieved by the Coast Guard buoy tender USCGC Blackhaw (WLB-390).
 On 5 February 1965, she unsuccessfully searched for an F-4B Phantom jet fighter aircraft near San Clemente Island.
 In early February 1966, she towed the disabled sloop Allegro from 360 nautical miles (670 km) south-southwest of San Diego, California, to Asuncion Bay.

Dexter was reclassified as a high endurance cutter and redesignated WHEC-385 on 1 May 1966.
Dexter was recommissioned on 30 June 1958 and assigned to a new home port, Alameda, California.  She departed Curtis Bay on 14 July 1958 under the command of Commander Bainbridge Leland, USCG.
Dexter arrived at Alameda on 11 August 1958. She assumed duty as the United States West Coast training ship for the United States Coast Guard Reserve training component.  She provided training at sea for Coast Guard Reserve recruits undergoing training at Alameda Training Station.  Manned by a complement of 83—eight officers, 10 chief petty officers, and 65 other enlisted men—to 85, Dexter had facilities for handling over 100 recruits at a time.  Recruits spent approximately three months aboard Dexter for indoctrination and one extended cruise beyond the waters of San Francisco Bay. Dexter also made cruises to various ports on the U.S. West Coast, as well as to British Columbia in Canada, Hawaii, Alaska, and Mexico, in connection with training activities.
Dexter also participated as a search-and-rescue patrol vessel for various sailing races and regattas, including the September 1958 America's Cup Race at Newport, Rhode Island, and the Transpacific Yacht Races from Los Angeles, California, to Honolulu, Hawaii, of 1959, 1961, and 1965.
Dexter also conducted search and rescue operations.  On 18 July 1959, she towed the disabled fishing vessel Cloud Nine until relieved by the Coast Guard buoy tender USCGC Blackhaw (WLB-390).  On 5 February 1965, she unsuccessfully searched for an F-4B Phantom jet fighter aircraft near San Clemente Island.  In early February 1966, she towed the disabled sloop Allegro from 360 nautical miles (670 km) south-southwest of San Diego, California, to Asuncion Bay.
Dexter was reclassified as a high endurance cutter and redesignated WHEC-385 on 1 May 1966.
USS Biscayne