Since we are properly trained in what to do, should we conceal carry to take care of the situation until proper authorities arrive?

There is a huge difference between being properly trained to deal with a terror or mass shooting situation and spending time on a firing range. The vast majority of even military personnel are not trained in police procedure or hostage situations. As a combat veteran I am familiar with combat and have no problem trusting any of my brothers in that situation. Not sure though we are trained to handle hostage situations or bank robberies.

Who properly trained you? Been in for a while and haven't received any sanctioned army training on how to deal with an active shooter other than online AT level 1 training. We are trained to fight as a fire team, squad, or even as low as a two man sniper team but never as a single element up against a shooter in civilian setting. Just food for thought.
But yes, we are trained more adequately in terms of lethal engagement, first aid, and critical thinking in high stress situations thab an average citizen but that doesn't make us first responder ninjas in a shooter situation.
Proper training for active shooter situations can be attained at your local NRA gun range and it can get pricey. It is definitely worth the investment if you plan to CCW carrier. I am not referring to the 1 day CC course either. It is a fairly intense 3-5 session lesson covering multiple situations.
MPs do receive more comprehensive OJT for active shooters so there's that. I am not familiar with Special Forces training on the matter but I am sure they receive some kind of training on it. Warfare training is different than what we need to be proficient CCW personnel.

That's just my 2 cents though.

Definately, the threat is apparently growing so we must be vigilant.