Sept. 7, 1961 - Fifty armed U.S. soldiers moved rapidly down the street, then took possession of buildings overlooking the East-West Berlin border. A jeep mounting an anti-tank gun and several others mounting machine guns moved into position along either curb. Two colonels arrived. It was the biggest turnout the U.S. Army had yet made along the wall that divides the city - and it was all for Jack Paar, TV star. Mr. Paar filmed one of his shows along the "concrete curtain," sometimes only an arm's-length from Communist policemen and cameramen.