They were identified as A97-467 and A97-468 of the RAAF's No. 37 Squadron medium tactical airlift squadron out of RAAF Base Richmond, in New South Wales.
Both Hercs looked to flying into Gladstone from RAAF Base Williamtown via airwork at the Gold Coast. In fact, on arrival into Gladstone, A97-467 completed more airwork including an overshoot off Runway 28 at Gladstone, as well as a touch-and-go.
A97-467 was heard to be using the radio callsign of "Ausy 698", while A97-468 was "Ausy 699".
Both Hercs are due to spend the night at Gladstone Airport with (I'm told) a busy day of 'community engagement' on Saturday 17 September including a flight opportunity for local Air Force Cadets. I don't believe that anything specific has been organised for the general public.
All photos taken by Michael Fleetwood ©