Point: There was a proposed D Day in August 1942 which was called off - hence OK...

campbeltown on Dec 3, 2012 | parent | context | favorite | on: WWII pigeon message stumps GCHQ decoders

Point: There was a proposed D Day in August 1942 which was called off - hence OK for Operation Chariot March 28th 1942. Also CMPWN - Campbeltown? See Call of Duty Failed D Day. It is a SPOOF - albeit a good one. Not to say it is indecipherable.