The destroyer was decommissioned on 31 January 1970 to undergo prolong antisubmarine warfare modernization at the Philadelphia Naval Shipyard. Extensive improvements to sensors, weaponry, communications, and crew habitability were accomplished and on 19 April 1971, she was recommissioned and joined CruDesFlot 4 in Norfolk. Following her shakedown deployment in Guantanamo in the spring of '72, "Manley" joined DesRon 12 and took part in the program to forward deploy ships in overseas homeports. DesRon 12 and "Manley" entered their new homeport, Athens, Greece, on 1 September 1972. During the next thirty months, she was called upon frequently to participate in speed contingency exercises: the October 1973 Arab-Israeli and Cyprus crisis of 1974. "Manley" became the first United States warship to visit Izmir, Turkey in December 1973. On 22 July 1975, the destroyer headed for a scheduled upkeep and maintenance in Philadelphia and in December 1976, was home ported to Mayport, Florida.