Sergeant From ArcadiatDynamite JugglerNEAR THE FRONT IN KOREA —— Sgt. Rudolph Pogreba of Arcadia. Wis., is one ofthe U. S. army's dynamite jugglers/’ *Blowing up bridges and building them back—it's all in a war’s work for the U. S. army engineersto which Sgt. Pogreba is attached.These dynamite jugglers have slowed by precious hours and days the forward leaps of the death-snorting Communist tanksfrorrANorth Korea.Rail and highway bridges, culverts and chunks of the main highway itself have exploded behind withdrawing American troops.The engineers don't seem to meditate much on the damage a sniper’s bullet might do to theexplosives they lug around. They go doggedly about their destructive work and take a certain pride in watching a bridge fly to pieces.;4fiCapt. William H. Corrin. 35. Omaha. Neb., spoke appreciatively what 1.400 pounds of dynamite had done to one of the bridges over the Kum river, where American troops Thursday set up their strongest defense line to date.It sure went with a bang ” he remarked.But don’t think we enjoy blowing up bridges. Remember, we are the people that will have to build back all these bridges when we start going in the other direction.It’s funny. Here we are blowing up bridges. And down the line other engineers are working on the roads. That's the engineers for you.”Lieut. Robert Mann, 25. of Pittsburgh and Lake Wales, Fla.; Sgt. Pogreba, Arcadia, Wis., and Pvt. Edward Howser, 18, Rochester. N. Y., set out Friday to pick likely bridges for destruction.1