Answer: Your best bet would be France but to be honest i'm really unsure
Explanation:
According to my research it says : "On June 6, 1944, Supreme Allied Commander General Dwight D. Eisenhower gives the go-ahead for the largest amphibious military operation in history: Operation Overlord, the Allied invasion of northern France, commonly known as D-Day. By daybreak, 18,000 British and American parachutists were already on the ground."