American "peace mom" Cindy Sheehan called for the closure of the U.S. military prison in Guantanamo, Cuba, as she and other activists arrived here Saturday to draw attention to the nearly 400 terror suspects still held at the remote site. Sheehan is among 12 human rights and anti-war activists who will travel across this Caribbean island next week, arriving at the main gate of the Guantanamo base on Thursday — five years after the first prisoners were flown in. "Anyone who knows me knows that I am not afraid of anything," Sheehan said when asked about the possibility of U.S....