conflict

[tpw536w]

During which conflict did 'Kilroy was here' become a widely used graffiti slogan?

thanks for any help

[Ont-ice]

noun: a nonexistent person popularized by American servicemen during World War II (Example: "Kilroy was here")

[possetpie]

This inscription "Kilroy was here" is thought to have started with a man named James J. Kilroy, who was a shipyard inspector during WWII. He chalked the words on bulkheads to show that he had been there and inspected the riveting in the newly constructed ship