Bridging A Gap -- An experimental scissors-type bridge which is carried and launched by a turret-less tank, left, unfolds during a demonstration at Fort Belvoir, Va. Made of aluminum, the bridge is designed to carry loads up to 60 tons. Operated hydraulically, the bridge folds back over the tank for carrying. It was developed by the army engineers at their Fort Belvoir research Laboratories. December 29, 1953. (Photo by AP Wirephoto).