A few things to consider...
1. MSG Grisham is a problem child who likes to stir up issues. He was relieved of his duties as a 1SG (1st Sergeant) before this incident and reassigned. A 1SG post is a very prestigious position that demands tact, judgement and working with superiors to resolve sometimes delicate issues. His being relieved speaks to his inability to get along. And while he's a decorated combat veteran, so what? So am I, with two combat tours. Being a combat vet doesn't give you a pass on acting stupid.
2. The MSG has set up defense funds previously for other incidents he's been involved in, with no accounting for the money. After he got the amount he "needed" on this latest one, it was shut down. Not making any allegations here, just stating facts.
3. While open carry of a rifle is legally allowed in TX, there are conditions. It can't be carried in a manner to cause alarm or in a threatening or rude way (paraphrasing the law). The cops have every right to disarm someone during an investigation for their safety. It's their call. The MSG resisted and argued, with a loaded rifle and pistol. Not good. He knows better.
4. Arguing with the police with your son present is shameful and says a lot about the MSG. I'm sure that leaves a sense of great respect for authority with his son. A senior US Army NCO should conduct himself more professionally.
5. I am also an E-8 (1SG), with two combat tours, a couple of Bronze Stars and a CIB (Combat Infantryman's Badge). My past combat time doesn't give me a freebee to argue, insult or interfere with cops doing their job. Radio calls must be answered and investigated. Grisham is an embarrassment to the NCO Corps and the Army.
6. Before I went back into the Army and volunteered for combat, I was a cop. I treated Soldiers and Marines well; I gave them rides, took them to the USO, got them back on the bus to Pendleton or Irwin and protected them when they were intoxicated or injured. If they were stupid, argued or wanted to fight, I restrained and booked them and let the MPs handle them. My insight, based on being on both sides of the fence.
Bob