In 1966 cruises saw her in the Bermuda area for NATO exercises (April); off the New England and Virginia coasts for convoy escort and ASW exercises (June, July, and August); and in the Caribbean for fleet tactical exercises (November–December). From 16 January until 24 May 1967 she participated in exercise Matchmaker III. This operation, which took "McCloy" from the Caribbean to northern Europe, was conducted jointly by American, Dutch, British, and Canadian ships. In what was called "Cross Pollinization," "McCloy" men transferred to the Dutch destroyer and the British frigate while men of those ships came on board the American escort vessel. also participated in the exercise.