Omaha was the make-or-break Allied beach on D-Day--in (perhaps) the make-or-break campaign of World War II. If American soldiers couldn't gain a foothold there, then D-Day was unlikely to succeed. On June 6, 1944, U.S. troops on Omaha suffered the worst casualties of any of the five Allied invasion beaches--so many casualties, and so much tactical difficulty, that Omaha almost didn't succeed. One big reason why Americans gained a foothold on Omaha...