The RAAF came close to sending a fully armed fighter jet to shoot down a
light plane during last year's Commonwealth Heads Of Government Meeting.
The light plane was detected flying towards restricted air space around
the conference venue. Air Commodore Dave Pietsch said a fully armed
F/A-18 Hornet fighter was prepared to intercept the aircraft and
commanders had full authority to order the Hornet to shoot it down.

http://www.smh.com.au/articles/2003/...050611557.html