TEHRAN, IRAN-November 28, 2004 — The 300 men filling out forms in the offices of an Iranian aid group were offered three choices: Train for suicide attacks against U.S. troops in Iraq, for suicide attacks against Israelis or to assassinate British author Salman Rushdie. It looked at first glance like a gathering on the fringes of a society divided between moderates who want better relations with the world and hard-line Muslim militants hostile toward the United States and Israel.