Answer:
D-Day is the day on which a military assault or operation is to be conducted.
Step-by-step explanation:
D-Day is basically a military conduct in which an attack is to be conducted or put in operation.
In the Army, D-Day is the day on which a military assault or operation is to be conducted. The best known D-Day came during the Second World War, on June 6 1944—the day of the Normandy landings — initiating an attempt by the Western Allies to liberate Western Europe from Nazi Germany. Hope this helps :)
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