The Libyan militia group that the State Department hired to defend its embattled diplomatic mission in Benghazi had clear al-Qaida sympathies, and had prominently displayed the al-Qaida flag on a Facebook page for some months before the deadly attack. That organization, the February 17th Martyrs Brigade, was paid by the U.S. government to provide security at the U.S. diplomatic mission in Benghazi, Libya. But there is no indication the Martyrs Brigade fulfilled its commitment to defend the mission on Sept. 11, when it came under attack. The assault claimed the lives of four Americans: Ambassador J. Christopher Stevens, information officer...