Boeing CH-47 Chinook

The Boeing CH-47 Chinook is an American twin-engine, tandem rotor heavy-lift helicopter. Its top speed of 170 knots (196 mph, 315 km/h) is faster than contemporary utility and attack helicopters of the 1960s. It is one of the few aircraft of that era, such as the C-130 Hercules and the UH-1 Iroquois, that is still in production and front line service with over 1,179 built to date. Its primary roles include troop movement, artillery emplacement and battlefield resupply. It has a wide loading ramp at the rear of the fuselage and three external-cargo hooks
The CH-47 is among the heaviest lifting Western helicopters capable of lifting artillery pieces downed or damaged aircraft.
During the building of the 1st Australian Task Force (1ATF) at Nui Dat the Task Force was heavily reliant on the Chinook for ferrying in large amounts of equipment and supplies as the only road connecting Vung Tau with Nui dat was Route 2 which was dominated by the VC and was regarded as 'hostile'.

Reference: vietnamwar.fandom.com