The M-450 series of combat engineers' bulldozers was developed at the end of World War II and were in service from then through the Vietnam War. They were light enough to be transported by air and then dropped where needed.
M-450 1967 Case Bulldozer used by 8th Engineer Bn. of the 1st Cavalry Division. Photographed at the 1st Cavalry Division Museum, Ft. Hood, TX, 2 December 2005. Photo: Courtesy of Bob Pettit.
CH-54 Sky Crane delivering air transportable bulldozer to a forward position in Vietnam, October 1966.
