Late on Tuesday afternoon, United States Air Force (USAF) Boeing C-17 Globemaster III 07-7186 arrived at Cairns. It was heard using the callsign, "Reach 138".
Unfortunately, it is unknown as to where it arrived from.
Some more photos:
USAF Boeing C-17 07-7186 arriving at Cairns
It is believed to have departed a few hours later.