Oh yes, I remember this day as well. I had actually left post for an early lunch break, (I wasn't yet in-processed completely) and wound up unable to get back on post that day due to the lock down.
Obviously a religiously motivated attack, not simple workplace violence. The Obama administration deflecting this attack as not being about religion helped to further inflame an already inflamed Right leaning America, as did several of his policies, not the least of which was the highly controversial bathing of the White House in the gay pride colors. Spiritual Sodom, anyone?