evidence: NATO copter downed; Navy SEALs among the 30 U.S. dead [...] The Taliban asserted responsibility for the attack and the deaths of the 30 U.S. service members and eight Afghans on board. In addition to the 22 SEALs, there were eight U.S. troops from the Army and the Air Force. [...] KABUL — A NATO helicopter was shot down during an overnight operation against the Taliban in eastern Afghanistan, killing 30 U.S. service members, including about 20 SEALs from the elite SEAL Team 6 counterrorism unit that carried out the mission to kill Osama bin Laden, the coalition said.