Kilroy was here

 Featuring excerpt from Wikipedia

https://en.m.wikipedia.org/wiki/Kilroy_was_her

Kilroy was here is a meme that became popular during World War II, typically seen in graffiti. Its origin is debated, but the phrase and the distinctive accompanying doodle became associated with GIs in the 1940s: a bald-headed man (sometimes depicted as having a few hairs) with a prominent nose peeking over a wall with his fingers clutching the wall.... According to Charles Panati, "The outrageousness of the graffiti was not so much what it said, but where it turned up." It is not known if there was an actual person named Kilroy who inspired the graffiti, although there have been claims over the years....The phrase may have originated through United States servicemen who would draw the picture and the text "Kilroy was here" on the walls and other places where they were stationed, encamped, or visited. An ad in Life magazine noted that WWII-era servicemen were fond of claiming that "whatever beach-head they stormed, they always found notices chalked up ahead of them, that 'Kilroy was here'". Brewer's Dictionary of Phrase and Fable notes that it was particularly associated with the Air Transport Command, at least when observed in the United Kingdom...According to one story, German intelligence found the phrase on captured American equipment. This led Adolf Hitler to believe that Kilroy could be the name or codename of a high-level Allied spy. At the time of the Potsdam Conference in 1945, it was rumored that Stalin found "Kilroy was here" written in the VIP bathroom, prompting him to ask his aides who Kilroy was.[2][9] War photographer Robert Capa noted a use of the phrase at Bastogne during the Battle of the Bulge in December 1944: "On the black, charred walls of an abandoned barn, scrawled in white chalk, was the legend of Gen. Anthony McAuliffe's soldiers: KILROY WAS STUCK HERE."...One theory identifies James J. Kilroy (1902–1962), an American shipyard inspector, as the man behind the signature.[6] James Kilroy had served on the Boston City Council and represented the Roxbury district in the Massachusetts Legislature during the 1930s. He worked at the Fore River Shipyard in Quincy during the war checking the work of riveters paid by how many rivets they installed. Usually, inspectors made a small chalk mark which riveters used to erase, so that they would be paid double for their work. To prevent this, Kilroy marked work he had inspected and approved with the phrase "Kilroy was here" in more durable crayon.

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