"Fiske"s classification reverted to DD-842 on 1 April 1964. Under the command of Cdr. John R. Ewing, "Fiske" underwent a Fleet Rehabilitation and Modernization (FRAM Mark I) at Brooklyn Navy Yard during 1964. Among other things, "Fiske"s second forward gun mount, Mount 52, was removed, and replaced by a pair of triple-mount Mark 32 torpedo tubes. The superstructure was replaced and an Anti-Submarine Rocket (ASROC) launcher and launch station was installed between the funnels on the 01 level. Aft of Stack 2 the superstructure was modified to include a Magazine (on the port side 01 level) for torpedoes, ASROC rockets and warheads, and depth charges for the DASH (Drone Anti-Submarine Helicopter) system, and a hangar starboard side 01 level for the two DASH helos. Aft of this superstructure the remainder of the 01 level was flight deck.