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D-Day produced thousands of code names, acronyms, abbreviations and many other strange and unusual terms and names!

We have compiled a list of some of the most common terms related to D-Day. If you think something is missing, please let us know.

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"cossac"

COSSAC

Chief of Staff to the Supreme Allied Commander. Lieutenant-General Sir Frederick Morgan was appointed as COSSAC in 1943, before a Supreme Commander had been appointed. His staff developed the early plans for the D-Day landings.