Wildcat
Major
Eric the blue rudder with the Southern Cross emblem was used by Mustangs from No. 3 sqn RAAF. The actual squadron code should be CV. 3 sqn operated Mustangs from Italy from Nov 44 until the end of the war. I doubt they were ever painted in desert colours instead it should be the green/grey combo as used by the RAF. Some were also bare metal as Wurgs mentioned. I'm sure Gordy knows more about this then me.
Here is a pic of a restored a/c in Australia painted in the camo scheme and also a pic of a bare metal bird. Source of pics unknown.
Here is a pic of a restored a/c in Australia painted in the camo scheme and also a pic of a bare metal bird. Source of pics unknown.