従軍記者
War correspondent William H. Stoneman wrote of Halperin, "His job is to mark beaches for the assault, infantry, a daring, intricate job, calling for as much brain as courage, and barrels of both." He was in charge of 14 scout boats, the first to arrive in France in the Normandy landings. Halperin saw action in Sicily, Italy, Europe (including during D-Day), North Africa, and the Pacific.