Completing overhaul on 15 November 1964, "Robert A. Owens" served as schoolship for the Fleet Sonar School and, after refresher training at Guantanamo Bay, joined the Recovery Force for Gemini-Titan 3 (GT3) in March 1965 and Gemini-Titan 4 (GT4) in June. On 27 November, she sailed for an extended deployment to the 6th Fleet and Middle East Force, returning to Fleet Sonar School ship duty in May 1966. She then operated in the Atlantic until deploying to the Mediterranean during the first five months of 1967. The balance of the year was spent in Atlantic operations, schoolship duties, and overhaul which was completed on 11 March 1968.