My only comment is that at the very least, the Military Police on any US Base should be armed—again, one armed person could have taken this guy out before he did as much damage as he did.
Just to set the record straight, MPs are always armed on every installation - foreign & abroad (while on duty).
The problem is that the number of MPs deployed on US soil (and to a slightly lessor degree off US soil) has been steadily (and greatly) reduced since the early '90 draw-down. The have, in large part, been transitioned to either private security contractors, or deputized DoD police officers (as was the case at Ft. Hood).
The military police at Ft. Hood are routinely armed, 9mm M9 pistols. The civilian post police are also armed. The contract gate guards are armed too. But there were none of them at the point of need. There were only ordinary soldiers, medical personnel (military and civilian) who would be punished, before or after the shootings, if they so much as had a weapon in their vehicles, let alone on or about their persons.
Just goes to show, Jihadies, like ordinary criminals, prefer unarmed victims.
In the end it was one of those civilian DoD policemen who dropped Hassan, who remains paralyzed as a result. However another cop, a marksmanship instructor, missed and was herself shot. She ended up in the same hospital I was in last summer for my two knee replacement surgeries. Had at least one of the same physical therapists there too.
She was thought not to be too badly injured, but she almost bled out on the way there. But it's not much farther from the scene than the military hospital would have been, especially time wise. She has permanent injuries that will prevent her from resuming her duties. She was moving to another post anyway to join her soldier husband. (She was a former soldier IIRC)
Only armed non police would have helped that day. Armed doctors, nurses, techs and clerks. (or contractor engineers :)) Along with some of the soldiers being processed through the facility. No different than the civilian world, there is rarely a cop at hand when the stuff hits the fan.