Martin Sheen and 75 other marchers were led away in handcuffs following a protest demonstration at Los Alamos (N.M.) National Laboratory -- birthplace of the atomic bomb -- on the 54th anniversary of the bombing of Nagasaki. The detainees were among some 400 people who protested Monday against the lab's continuing production of plutonium pits, the core of a nuclear bomb. "We are the generation that brought the bomb in. We have got to be the generation that should take it out," the actor, 59, said during a mile-long march to the lab. Sheen was taken into custody after he stepped over a yellow cord into a restricted area. He knelt and said the Lord's Prayer, then told security agents: "I'm all yours."