If you were doing a threat assessment of Micah Johnson's attack in Dallas, what key points would you highlight?

It is fair to liken his actions to that of an insurgent, the tactics he used were much the same. A sucker punch if you will. He like McVeigh was willing to die to get his point across and take as many people with him as possible; again like an insurgent. Perhaps that is what we should be more concerned about, people adopting the methods used by insurgents and using them in the U.S. It is claimed that Johnson had explosives, this to is the way of the insurgent. The scary thing is that you do not have to be a chemist or have taken chemistry to make them. All you need is a search engine or perhaps TOR to search the dark net. The Lunatic James Holmes had set up a powerful bomb in is apartment and he did have a strong background in chemistry, luckily the bomb squad disarmed it. We are so very lucky that he did not decide to use the tactics of Timothy McVeigh, he easily could have with his skills. If anything I guess we can use history: Guy Fox.

He isn't/wasn't a military threat. It was civil in nature. He was a US Citizen with no signs of radicalization from an external (outside of the U.S.) organization. You can call him an insurgent, a terrorist or a criminal. I think in some ways all three fit him to some degree.

As far as we know, he had sympathy with BLM but no actual affiliation (he was not a member). How do you countermeasure one person in a nation of 300 million? From what I have read (we clearly do not have all of the details yet) there were not many real hot buttons. He was booted from the Army, so what, lot's of people are. Not for violence (I think theft of women's underwear). I have read nothing about statements or threats he made that would put him high on the horizon either.

No criminal record to speak of (or so I have read). Again, no final/complete investigation to go on but counter measuring someone like him would be tough. The only real option is for people to watch the heated rhetoric calling for the killing of the police or the mistrust of the police etc. That is not likely to happens since the President readily and quickly does so at almost every opportunity. The fish rots from the head down.

1LT William Clardy I appreciate the invite to participate in this professional topic and appreciate you starting the conversation, but at the moment I am too ignorant of the facts to do so responsibly.