US paratroopers, carrying full equipment, walk in single file to board their transport - a DC-3 Dakota - for the invasion of Normandy on D-Day. Hulton Archive, Getty Images

American General Dwight D. Eisenhower, the supreme commander for the 1944 cross-channel invasion of the continental mainland, giving orders to the paratroopers before the landing operations during the Second World War on June 6, 1944. AFP, US National Archives/AFP Via Getty Images

US troops in landing craft, during the D-Day landings on June 6, 1944. Keystone, Getty Images

US troops prepare to disembark from landing crafts during D-Day, June 6, 1944, after Allied forces stormed the Normandy beaches. D-Day is still one of the world's most gut-wrenching and consequential battles, as the Allied landing in Normandy le

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