Ahead of the 80th anniversary of the D-Day landings along the Normandy coast, RAF veteran Gilbert Clarke recalled the moment when he knew the invasion of France was under way. Clarke, then an 18-year-old Royal Air Force volunteer from Jamaica, was still a trainee learning about the intricacies of radar systems when the roar of aircraft engines forced him to look to the heavens on June 6, 1944. (AP video shot by: Kwiyeon Ha)