In 1921, on the 31st of March, the Australian Air Force was formed. It was then only the second air force to exist, after the RAF. In August it was given the prefix "Royal" and in that same year the number of aircraft (about 127 of which were given by the British) was greater than the number of air force personnel!
By World War Two, the RAAF had grown to be the 4th largest air force in the world! Today, the numbers are down to about 13,500 personnel, operating only a fraction of the number of aircraft.
Happy 87th Birthday to the RAAF!