There have been a variety of spree killings accomplished solely with handguns by people without significant military training that had a final dead and wounded toll at least in the ballpark of this one.
Oddly I think the whole military training thing is "wishful thinking" - too frightening to contemplate this being possible by someone without military training
Guy who killed 23 in a diner in Killeen Texas used only 9mm pistols and had some brief Navy and Merchant Marine experience (and no, not a SEAL.)
Looking around the world you'll see a few others in the plus 10+ range only with handguns and no military training.
And are people implying that thinking to chain the door shut behind you is some sort of specialized military training?
Talk about "Inconvenient Truths" for the antigunners.
Obviously this shooter was a very disturbed individual. But he moved so methodically, and with one of the victims being such an oustanding contributor (evidently) to significant research ror military purposes - it just passed through my brain maybe he was the target. And the others just collateral damage. Obviously that appears not to be the case. Should have waited longer for more information - was going on Shep's "reporting" of a rumor that was not true. Lesson learned - ignore Shepherd Smith (I usually do).