New "Workhorse" Helicopter Largest Built For U.S. Military -- The new Air Force helicopter, "The Workhorse," capable of carrying 14 soldiers or 12 litter patients, is shown today at a public demonstration as a smaller helicopter, the HUP, hovers in background. The new helicopter is the largest ever built for the U.S. military service. It is designed so that it can be equipped with flotation gear for land, swamp or water landings in rescue operations. May 5, 1952. (Photo by AP Wirephoto).