A Navy SEAL sacrificed his life to save his comrades by throwing himself on top of a grenade Iraqi insurgents tossed into their sniper hideout, fellow members of the elite force said. Petty Officer 2nd Class Michael A. Monsoor had been near the only door to the rooftop structure Sept. 29 when the grenade hit him in the chest and bounced to the floor, said four SEALs who spoke to The Associated Press this week on condition of anonymity because their work requires their identities to remain secret. "He never took his eye off the grenade, his only movement was...