"Biddle" resumed 2d Fleet operations in May. Over the next three months, she put to sea a number of times to train Naval Academy and NROTC midshipmen. Early in August, she participated in a joint Navy/Air Force electronics warfare exercise. The latter part of the month, she spent at sea taking part in simulated war exercises. Upon her return to Norfolk, "Biddle" began preparations for her regular overhaul. On 24 September, the guided-missile cruiser departed Norfolk and shaped a course for Philadelphia. She arrived at her destination on 25 September and, three days later, entered the Philadelphia Naval Shipyard to commence her extended repair period. The overhaul lasted more than a year, taking up the remainder of 1979 and apparently all of 1980.