But for a visit to Havana, Cuba, the wooden-hulled nonmagnetic coastal minesweeper spent the remainder of 1955, operating in South Carolina and Florida waters.

That summer, she cooperated with Warner Brothers during the shooting of the film "Up Periscope", and then returned to her primary duty plying California's coastal waters as a minesweeper with the San Diego Harbor Defense Command.

On 8 May 1959, Thrasher departed San Diego and steamed independently to Hawaii for additional tests of the new degaussing system which had been designed to compensate for changes in latitude and longitude.

After work on her degaussing system and installation of "Shoran" at the Hunter's Point Naval Shipyard, Thrasher participated in minesweeping exercises out of Long Beach, earning a letter of commendation from Commander Mine Force, Pacific Fleet, for her performance.

In the summers of 1966 and 1967, she joined Ruff and Cormorant to form naval reserve Mine Division 13 for exercises, including a month of operations in 1967, off the coasts of Washington and Canada.

[2] In March 1975, she made her last reserve training cruise, conducting minesweeping exercises in Monterey Bay before returning to San Francisco.