31 US troops die in Afghanistan; many from unit that killed bin Laden - MSNBC

KABUL, Afghanistan — A NATO helicopter crash in Afghanistan on Saturday killing 31 U.S. special-forces troops, including more than 20 Navy SEALS from the unit that killed Osama bin Laden, and 7 Afghan commandos. - SEAL Team Six Members Killed in Afghanistan Crash
Taliban claims responsibility
31 Americans Killed as Taliban Shoot Down a Copter - nytimes Chopper Attack Kills 31 U.S. Troops, 7 Afghans - WSJ