It is based on the Australian national flag, with the field changed to Air Force blue, and the southern cross tilted clockwise to make room for the RAAF roundel (which itself is a modified RAF roundel) inserted in the lower fly quarter.The roundel is a red leaping kangaroo on white within a dark blue ring.[1] The southern cross is tilted so that Gamma Crucis stays in the same position as for the Australian National Flag and that Alpha Crucis is moved along the x-axis towards the hoist by one-sixth of the width of the flag.[3] The old roundel remained on the ensign, however, until 1981, when Elizabeth II, who also serves the role as Queen of Australia approved the change to the current flag.This was in recognition of the school's involvement with the RAAF during World War II, when it was requisitioned by the government and used as No.