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Background: SELF PROPELLED BRIDGE UNITS THAT CAN TRAVEL OVERLAND AT 35 MILES AN HOUR AND GO IN AND OUT OF WATER WITHOUT ANY PREPARATION HAVE BEEN DEVELOPED BY THE U.S.ARMY RESEARCH DEPARTMENT AT VIRGINIA.FOR EASY HANDLING ON LAND, THE INTERIOR AND RAMP DECKS OF THE BRIDGE ARE CARRIED LENGTHSISE BY 16-TON VEHICLES.AS THEY ENTER THE WATER, THE WHEELS ARE HYDRAULICALLY RETRACTED UPWARDS INTO WHEEL WELLS FROM WHICH WATER IS FORCED OUT BY COMPRESSED AIR.

THE THREE-MAN CREWS OF 16 VEHICLES CAN ASSEMBLE A 400 FOOT SPAN BRIDGE IN A HALF HOUR -- THIS VASTLY IMPROVES THE CONVENTIONAL FLOATING BRIDGE WHICH TAKES 400 MEN TO CREATE.