A
cadet corps for people from the
ages of 13 to 18 years to teach them stuff relevant to the
air force. Think
scouts for teenagers who like
planes. It's basically a
recruitment organisation for the
Royal Australian Air Force. When I was doing it, we had to wear
funky uniforms once every
fortnight, and parade around. Occasionally, we would do something remotely related to
aircraft, but mostly we
marched around.
Most people do not get involved in AirTC (as it is sometimes known), completely voluntarily. Most times their high school (especially if it is a posh private school) gives them a limited set of options to get involved in either Air Training Corps or Cadet Corps, or as they were more commonly known, the grunts, who would also march around and occasionally do something involving the army.
Their Web page can be found at: http://www.airtc.defence.gov.au/
That URL should give you enough hints to scare you.