The cat was the unofficial WW2 badge of the 308FS, on some of their planes and
ground equipment; the crown was omitted on the B-29 as it wasn't a British aircraft.
There was a "CB" under the cat ( Construction Battalion) possibly changed later. They may have thought it looked more agressive than the 13th NCB pussy with the trolly. It seems to have been the only non-standard Seabees-related emblem in the 482BS.
( the pilot in the photo is Lt. Dick Hurd, not his regular Spitfire).
Apologies for any confusion.
Regards
Nick
308fs-insignia by
Nicholas King, on Flickr