 Helicopters played an extensive role in air operations in Vietnam, as Marine pilots flew CH-34s and later CH-46s and CH-53s to transport Marines into landing zones near suspected enemy concentrations, and to evacuate the wounded following combat engagements.Helicopters, supplemented by C-130 transports where there were landing strips, were also used to re-supply Marines in the field at remote outposts.Other Marine pilots flew UH-1E Hueys and AH-1 Cobras.