Kilroy became the US super-GI who always got there first — wherever GI's went. It became a challenge to place the logo in the most unlikely places. It was said to be atop Mt. Everest, the Statue of Liberty, the underside of the Arch de Triumphe, and scrawled in the dust on the moon. An outhouse was built for the exclusive use of Truman, Stalin, and Churchill who were there for the Potsdam conference. The first person to use it was Stalin. He emerged and asked his aide (in Russian), "Who is Kilroy?"
The Kilroy fad died some time in the 1960s, but can be still seen around the world.
"Kilroy Was Here, so piss off"