US presidential chopper spotted over Brisbane The US Marine Corp helicopter over Brisbane's CBD on Wednesday, ahead of the G20 summit. Photo: Nine News. Three United States presidential helicopters were flying over Brisbane on Wednesday afternoon as preparations for Barack Obama's arrival for the G20 summit ramp up. The helicopters bearing the green-and-white insignia of the US Marine Corps practised taking off and landing at a football field next to the Royal Brisbane and Women's Hospital at Herston. Mr Obama will arrive in Air Force One at the RAAF Amberley Air Base in Ipswich on Saturday morning after an 11-hour flight from Beijing, where he is currently attending the APEC Summit. One of the three helicopters is expected to fly Mr Obama from Ipswich to Brisbane, before he is driven to the Marriott Hotel in a motorcade. The G20 Taskforce warned residents and city workers that a number of helicopters would perform manoeuvres around Brisbane's CBD between noon and 2pm on Wednesday. "These are known and scheduled G20-related movements and every effort is being made to limit the noise impact on local residents," the taskforce said in a statement. Similar movements can be expected again over the weekend, especially on Saturday morning and Sunday afternoon, but potentially at other times. Three custom-built helicopters, operated by the US Marine Corps Helicopter Squadron One, are available to the President wherever he travels. The helicopters are either VH-3D Sea Kings or the smaller VH-60N WhiteHawks. In addition, two Bell Boeing V-22 Ospreys also made practice runs over Brisbane. The unique helicopters with dual tilt rotators are capable of making vertical take-offs and landings. The helicopters are codenamed Marine One when the president is on board. Marine One is often the preferred alternative to motorcades. Mr Obama is expected to deliver his landmark "Brisbane Speech" on Saturday morning to young Queenslanders at the University of Queensland's St Lucia campus. He is expected to fly out of Amberley Air Force Base late on Sunday evening once the G20 meeting has concluded.