Similar duty occupied her time during the first two months of 1964. On 3 March 1964, however, the oiler entered the yard at the Norfolk Shipbuilding &amp; Drydock Co. for a regular overhaul. She completed repairs and modifications late in June and put to sea on 29 March for a month of refresher training in the Guantánamo Bay operating area. At the conclusion of refresher training, "Aucilla" voyaged north to New York where her crew members visited the World's Fair. The ship returned to Norfolk on 8 August and resumed local operations. That resumption lasted just one month. On 8 September, "Aucilla" got underway from Norfolk once more to participate in a series of NATO exercises in the eastern Atlantic. She visited Bremerhaven, Germany, again at the end of the exercises early in October. She returned to Norfolk on 23 October 1964.