When recounting a "tall story", the response "Tell it to the Marines" implies, "Go and tell your sea-story to some gullible landlubber, because no sailor will believe you".
Dates back to the before the Napoleonic wars, in the Royal Navy.
Pilot #1: "I lost the starboard engine on the base leg, but I still managed to bring it it for a perfect three-point greaser"
Pilot #2: "Tell it to the Marines"
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