The destroyer’s next assignment sent her to Natal, Brazil, and then Casablanca, escorting . On 1 April 1944, she was ordered to Boston, Massachusetts to resume escort and antisubmarine patrol duties. In May, "McCormick" returned to transatlantic convoy duty with a run to North Africa. During the next 4 months, she touched at various ports, including Bizerte, Oran, Cherbourg, Falmouth, Belfast, and Milford Haven. Upon her return to Boston, 1 October, she spent 3 months in convoy and patrol operations off the U.S. East Coast and in the Caribbean before shifting back to the Casablanca run in January 1945.