The Greyhound was identified as 162154 / 30 and it is flown by the Fleet Logistics Support Squadron 30 (VRC-30 Detachment 5) the "Providers". It has been completing regular flights between land (usually RAAF Base Amberley) and the USS Ronald Reagan (CVN-76) which is due to dock in Brisbane in the coming days.
Indeed after a short while on the ground, 162154 / 30 "Password 30" departed Rockhampton Airport for Amberley.
162154 / 30 "Password 30" has deployed with fellow USN C-2A Greyhound 162170 / 31 "Password 31" and both were spotted recently arriving into Townsville.
Of interest, the Grumman C-2A Greyhound is a twin-engine, high-wing cargo aircraft, designed to carry supplies and mail to and from aircraft carriers of the United States Navy. Its primary mission is carrier onboard delivery (COD).
Photos taken by Daniel Bishop, Kayanne Hardsman, Trevor Hardsman, 'IAD', Ash Burggraaff and 'Shinpow16' ©