5. The “D” in “D Day” is simply a repetition of ‘Day”!
The D Day landings on June 6, 1944, signaled the start of the allied invasion of France and the beginning of the end of the Second World War in Europe. Some people believe that the “D” stands for doomsday or decision day. However, the explanation offered by the British Imperial War Museum is somewhat different: ‘D-Day is a general military term for the day on which an operation or exercise is planned to commence. The choice of the letter D has no significance, and any other letter could equally be used. Its only purpose is to provide a point of reference from which all other dates can be reckoned.”