In ManeuversUPPER SANDUSKY, April 13 —Pvt. Clayton Stone, of Me-Cutchenville, is participating in the final phases of Exercise Long Horn in central Texas as a member of the 91st Armored Field Artillery battalion, 1st Armored division. The battallion is equipped with self-propelled heavy weapons to provide close support for division task force*.If all the passenger cars Inthe United States were placed bumper to bumper, it is estimated the line would be 125,000 miles long.