Analysis of information sources in references of the Wikipedia article "Kilroy was here" in English language version.
In 1943, 32,000 employees worked at the Fore River Shipyard. One of them was James J. Kilroy, a Welding Inspector. He used chalk to mark the rivets and plates he inspected. The "Kilroy Was Here" mark was found throughout the U.S.S. Massachusetts Battleship and many others.