evidence: Navy Master Chief Petty Officer Louis J. Langlais dies at 44; SEAL was among 30 troops killed in downing of helicopter in Afghanistan [...] Over a 25-year career, Langlais rose to become a troop leader in the Navy SEALs’ elite Team Six, the secretive unit that killed Al Qaeda leader Osama bin Laden. And he was one of 30 Americans who lost their lives when their helicopter was shot down in Afghanistan on Aug. 6 — the deadliest day for U.S. troops in the nearly decade-long war. [...] "Even though he was a bad ass in his job, he was tender and funny with the kids," said Anya Langlais, his wife of a dozen years. "He’s not what you’d imagine a Navy SEAL to be."