During OIF in 2003 USAF airlifted the 1–63rd Armor battle group into Bashur Airfield in Northern Iraq. 1-62 was made up of two combat teams: one with 5 M1 and 5 M2 and the other with ~15 M113. To be combat effective this mechanised force was part of the 173 Abn Bde with two parachute infantry battalions. This entire force numbered 2,200 men and 400 vehicles (including the ~30 A vehicles). It took 62 C-17s sorties in four days to deploy this force. USAF allocated between 12 and 17 C-17s per day to this operation. The flight route for these deployments was a relatively short 4.5 hour sector from Italy to Northern Iraq.
This is a small scale air mobile mechanised force and the airlift required for it is far outside of the RAAF’s means. It would take our C-17 force upwards of two weeks to deploy such a similar force. Two weeks to deploy a light brigade with minimal force support is a recipe for disaster in anything other than the most benign combat operations. Much easier just to wait for the fat ships to arrive and land the entire force within a day or two.