No he didn't, the medics found several more loaded maganzines.
The other ones with drawn weapons were civilian security employed by Ft. Hood.
Possibly, even probably.
It ain’t easy gettin’a weapon on that post. Which makes me wonder how he got them one. As a US Citizen, with no criminal record, he bought them. They have confirmed that the FN 5.7 was bought at "Guns Galore" (Love the name, but I've heard they aren't very customer friendly) It's not a US miltary weapon, we don't even use the caliber. (Save perhaps a few "special" units.) The maganzines and ammunition are redily available on line.
As to getting them on post, he probably just threw them in the trunk of his car, or under a blanket in the back seat footwells, and gambled that his would not be one of the cars stopped for inception that day. (It's been months since I was inspected). There are other possibilities, which I'll not speculate on.
After I posted I saw where he fired more than 100 rounds. He had to reload many times. The initial report was the cops were there within 2 minutes. That means the guy was very qualified with these weapons which means it was planned for some time which means it was a terrorist act. Seems Joe Leiberman is the only one in D.C. willing to even consider it an act terrorism.
I made a delivery to Los Alamos a few years back and had to go through 3 check points with bomb sniffing dogs at every check. The sad thing is that once I got on base there were people running around all over the place in muslim dress. Seriously.