http://www.armchairgeneral.com/uss-robin-the-victorious-u-s-carrier-that-didnt-exist.htm
"This new fleet carrier was being called the USS Robin, but it was not listed in the USN inventory, and it couldn’t be The USS Essex, which was nowhere near completion. Yet there she was—a full-sized fleet carrier complete with American Avengers and Wildcats on her deck. "
Huh. I love military shenanigans and deception stuff.