"McCloy" spent the last half of 1967 and the first months of 1968 at Boston, Massachusetts, undergoing overhaul. She got underway again in March and sailed south, the next month, for refresher training at Guantanamo Bay, Cuba. Returning to Newport in June, she departed again 8 July for another extended cruise. On 11 July she arrived at San Juan, Puerto Rico where she joined naval units of the United States, Brazil, and Colombia for UNITAS IX. On 15 July, they commenced a clockwise circumnavigation of South America which first involved ships and planes of eight nations in exercises in the Atlantic, then around the Horn to the Pacific for more of the same, and finally through the Panama Canal back into the Caribbean before the end of the year. She continued her operations in the Atlantic into 1969.