Found online: "James J. Kilroy, a shipyard inspector, worked here at the Bethlemen Steel Shipyard here in Quincy, Massachusetts." (Also there's a restaurant/bar in Quincy named Kilroy's after him)
(some kids next to Kilroy display) http://flickr.com/photos/rpkrajewski/144843522/ It looks like it says "This Is The Home Of Kilroy" behind them.