evidence: A U.S. military helicopter crashed early Saturday in eastern Afghanistan, killing 30 Americans in the deadliest incident for U.S. troops since the war began. Seven Afghan commandos were also killed. [...] The U.S.-led coalition said that 30 American service members, a civilian interpreter and seven Afghan commandos were killed when the CH-47 Chinook crashed in the early hours Saturday. A current U.S. official and a former U.S. official said the Americans included 22 SEALs, three Air Force air controllers, and a dog handler and his dog. The two spoke on condition of anonymity because military officials were still notifying the families of the dead. [...] In that incident, 16 Navy SEALs and Army special operations troops were killed when their craft was shot down while on a mission to rescue four SEALs under attack by the Taliban. Three of the SEALs being rescued were also killed and the fourth wounded.