Men of the American assault troops of the 16th Infantry Regiment, injured while storming a coastal area code-named Omaha Beach during the Allied invasion of the Normandy, wait by the chalk cliffs at Collville-sur-Mer for evacuation to a field hospital for further treatment, June 6, 1944.  (AP Photo)

PHOTOS: D-Day: June 6, 1944

On June 6, 1944 — 70 years ago — the Allied invasion that tipped the balance and direction of World War II began.