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Two COPPists in a canoe used by them to reach landing beaches from submarines or boats. © IWM (MH 22716).]
Combined Operations Assault Pilotage Parties risked their lives to gather information about proposed landing beaches and in-shore waters, usually under the noses of enemy coastal defences, including land and sea patrols. It was hazardous work of great importance to the planners.
https://www.combinedops.com/COPPs.htm