 After three more weeks of upkeep and another assignment to the sonar school at Key West, the destroyer sailed to Guantanamo Bay to act as a gunfire support duty ship during the last week of October.On 27 November, following three weeks of preparation at Newport, "Basilone" commenced a four-month tour of duty with the 6th Fleet, serving primarily in the screen of a carrier task force in the western Mediterranean and visiting ports in Spain, Italy, and Majorca.Following her return to Norfolk in March 1965, upkeep, maintenance, and the installation of a drone antisubmarine helicopter (DASH) system occupied her attention until early June.