Disclaimer: I don't know anything at all about the tactics or terminology or the fandom, so that may colour my advice.

I like it. The second last paragraph was my favourite. You capture the atmosphere quite well there.

I did find it a bit hard to follow what was going on. It would be helpful if you added a bit more description of the actual actions of the various characters, rather than "hopping" from character to character so quickly in your narrative.

The physicality is the bit I find the most engaging in action scenes, so more of that would make it more exciting, for me at least.

I do really like your descriptions of the sounds and environment in the fight. Just a bit more description of the action of the human bodies, and not just their guns would be interesting, I think.