ICM Models 1/35 ICM Phu Bai Combat Base 1968 - Tarhe, Airfield Base & FiguresDescription The CH 54A heavy helicopters in Vietnam were mainly used for transport and occasionally for carrying the M 121 high explosive bombs. These bombs were modified with an extended nose fuze to detonate about 3 feet above the ground, effectively clearing forests for helicopter landing sites. One notable operation involved a CH 54A helicopter from Phu Bai Air Base, also known as Camp Hochmuth, in central Vietnam. The US Armed Forces started