P-51D is a CAC-18 MK 23 Mustang of 24 "City Of Adelaide" Squadron Citizens Air Force. Rare in the fact that it carries the "Kangaroo" emblem in the roundel. Soon after this type of roundel was introduced the RAAF phased out the P-51.
Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.