At the end of the usual month of leave and upkeep, "Barb" took up local training operations once again in July. In September, she participated in the multinational exercise RIMPAC 73. During the remainder of 1973, the submarine returned to local training duty and began preparations for her second refueling overhaul scheduled to begin the following spring. That overhaul commenced when she entered the Mare Island Naval Shipyard on 1 March 1974, and lasted for just over 20 months. During that time, her home port was changed from Pearl Harbor to San Diego so that, when she completed the overhaul early in November 1975, "Barb" began her refresher training out of that new home port. Similar assignments carried out all along the west coast of North America occupied her time for almost 16 months. She did not start preparing for another tour of duty overseas until late in 1976, and the deployment itself did not begin until early in 1977.