I will say this in light of my former profession as a .mil LEO...

Many bases, USAF in particular, have damn good cops and DoD Police on duty and ready to go at a moment's notice. Reaction times are under five minutes for most incidents and probably less in such a situation. Fort Hood actually had a decent response time by the DoD Guard (Kim Munley) that arrived on scene first since she had been in that area. However, the damage had been done already. Why?

First off, because the military by and large loves to concentrate large amounts of people in confined spaces (briefings, processing, ceremonies, etc) without proper protection. I.E. no armed guards nearby or assigned. Should be an easy fix to have someone already armed, trained and proficient helping with force protection, right?

Wrong. The military, by and large, doesn't like for its members to be walking around with firearms because "OMG! SOMEONE HAS A WEAPON AND THAT'S UNSAFE!" Emphasis on small arms training is generally relegated to pre-deployment/deployment times and heaven forbid if they actually spent some time and effort into keeping a bunch of non-traditional combat arms folks trained AND with weapons nearby. Maybe?

Nope, let's keep them locked away in an armory somewhere else on base because heaven forbid we actually buy a safe or some form of weapon locker and keep firearms in work areas where they just might be needed. Because we have cops on base, right?

And they're minutes away when seconds count. I know this for a fact because I lived it for twenty years. Furthermore, non-combat roles that never see a weapon with the exception of deployment, think of carrying a firearm as a nuisance and have zero proficiency with it. That might involve actually spending money, time and training to ensure every Soldier, Sailor, Marine and Airman is an individual force protection asset and initial responder for times like these. Commanders don't want that. Why? It can't ever happen here...

Until it does. And do we change? Nope. The situation will continue and more unnecessary deaths will continue on military bases because:

A. They lack the funding to train even a small percentage of military members to be armed in the workplace
B. They lack the desire to have even a small percentage of military members trained to be armed in the workplace
C. They lack the weapons to actually have a small percentage of military members trained to be armed in the workplace
D. It won't affect them until it actually happens, then wait a couple of months and go back to what they were doing before
E. Frankly, military leadership doesn't trust their subordinates outside of a combat zone to carry weapons in the workplace unless they are LEOs, SOF or going to/from the range

Most every base out there worldwide, save hostile fire zones, is a potential Disneyland for an active shooter. Does the military change?

Nope.