Military Corvair's? Yes, as a matter of fact. Canadair Company was primarily an aircraft manufacturer, but they did design and produce other vehicles including the Dynatrac. Today’s CPotD of this multi-terrain, high mobility tracked vehicle that’s powered by a single 70 horsepower Corvair engine was taken on a highway in Vietnam. The stock engine was modified to fit the different engine bay and drive the different transaxle. There are lots of photos and information at this thread on the CorvairCenter forum and on this page about Canadair vehicles and this excellent page on the origin of the vehicle.