This is interesting. I knew al-Aulaqi/al Awlaki was an imam in three mosques including one in San Diego but I didn't know Major Hassan knew the imam from any mosque other than Dar-al-Hijrah in Virginia. If he knew him when he was imam in San Diego then it's quite possible Major Hassan attended at the same time as two of the 9/11 hijackers.
Awlaki had been Hasan's spiritual leader at two mosques, Masjid Al-Ribat Al-Islami in San Diego and the Dar al-Hijrah Islamic Center outside Washington, D.C.