In April 1944, six weeks before the massive D-Day invasion of France on June 6th, nearly 700 Americans were killed during a clandestine Allied training exercise that went horribly wrong. It resulted in more fatal American casualties than the actual D-Day landings on Utah Beach. In AMERICA’S SECRET D-DAY DISASTER, experts examine a series of major issues leading to unnecessary deaths during the exercise, including the Army-issued life belt that differed from those worn by the Navy and an awful tragedy associated with the M1 helmet, which a large number of the army troops wore.