This is the graphic and untold story of the pilots and crews of Australia's fleet of Iroquois helicopters during the Vietnam War- their triumphs and losses, and the legacy of the experience that many still carry today. 'Shockwave' is told in the words of three Australian helicopter airmen, Norm Goodall, John Scott and Neville Sinkinson, who supported ground troops in this vicious war fought in jungles and mountains against an almost invisible enemy. It focuses mostly on the helicopter gunships, callsigned Bushranger-heavy-duty airborne weapons platforms, armed to the teeth with machineguns, rockets and miniguns. But Iroquois were also used as commuter taxis to carry troops into and out of operations areas, to back up troops with supplies and ammunition, and to evacuate the wounded and ill in missions known as Dustoffs. These stories are also told here.