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Kilroy was a visual meme drawn by soldiers in WWII. He may have been derived from a British figure named Chad, though many other explanations are out there. One of the claims as to the origin of his name was given by a Mr. Kilroy.
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The version I heard was that Kilroy would write it on welds in hulls... and then when the hull was fitted out you'd find 'kilroy was here' crossing behind bulkheads or in places that no-one could possibly reach in a fitted-out ship. Hence it's elevation to mystique... Kilroy got into places that it wasn't possible to get into.
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According to some Kilroy was James J. Kilroy (1902β1962) who used to write "Kilroy was here" when checking ships at the Fore River Shipyard in Massachusetts during WWII. http://www.worldwidewords.org/qa/qa-kil1.htm