Assigned to Capt Archie Chatterly Don Allen cleverly incorporated Capt Chatterly's home town of San Diego into his design. The lower signpost reads "San Diego via Berlin". Unfortunately for Chatterly, it proved to also be via a POW camp in Germany after he was shot down on 27th March 1944 in another aircraft. When 4th Fighter Squadron re-equipped with Mustangs, "California or Bust" was transferred out of the 8th Air Force and into the 9th. On 23rd June 1944, whilst assigned to 405th Fighter Squadron it was lost on a tactical support mission in France.