I do not know when you served, but for the past 20 years the far right has been infiltrating the military so much that it's recognized as a serious threat.
https://www.nationalmemo.com/far-right-in-the-military
My brother served in Afghanistan and Iraq, 82nd Airborne and Army Intelligence. My sister served in Naval Intelligence for both as well. They saw first hand the changes occurring back then, and the quality of the recruits coming in.
Regardless, all of this isn't the point. The point is that if you are serious you need to get the fuck off forums and go organize. There are likely groups in your area working on community defense. Show yourself trustworthy and you will be recruited for further actions. Accept direction from those who have been doing this for decades, starting with the skinheads in the 80's in Portland.
I've been actively involved since 2018 specifically with antifascism (political organizing I've been involved with sine 2006) and the brand of liberal democrat who sits on forums and tells people we need to fight back is the brand who absolutely will not be fighting the moment it is even slightly inconvenient for them. Fascists win via apathy, getting and keeping people engaged, actively guarding communities that are under threat (lgbtq/people of color/indigenous/disabled/etc), community aid, protest, strikes, these are the things that ultimately defeat fascism.
It may come to an armed uprising, but I'm not going to discuss that on a *public forum* and anyone who encourages that kind of discussion in such a space should absolutely be suspect.
In whatever group you join, be on the lookout for fascist enabling behavior. That is how movements are undermined. I was a political leader for years in the Seattle area, when I took over an organization I had one article I assigned my board to read and understand as it underpinned acceptable and constructive behavior and made it clear what would get people removed. Strong advice to anyone here *serious* about organizing against fascism to read and comprehend it (hint: it's not just about misogyny):
https://truthout.org/articles/why-misogynists-make-great-informants/