dec 1, 1943 - Exercise Tiger: D-day Training event that was second-highest number of U.S. fatalities in a single day of the war, topped only by the attack on Pearl Harbor

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Gen. Dwight D. Eisenhower threatened to court-martial anyone who revealed the training debacle. More members of the Army’s 4th Infantry Division died that day than in the Normandy invasion itself on June 6, 1944; it resulted in the second-highest number of U.S. fatalities in a single day of the war, topped only by the attack on Pearl Harbor. Some facts leaked after D-day, but the whole story wasn’t told until recent years.

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