Yes, and you know what? A shitload of them have separated or want to when their time is up because they hate this shit, but most have their hands tied and have to bide their time until they finish their obligation and can separate, and they have to keep their noses clean and not publicly criticize any of the operations at the border, else they draw the anger of the higher-ups who don't want Abbott and Co. pissed.
None of them signed up to do this shit - if they wanted to do this full-time, they would have joined Border Patrol/ICE, and they'd be paid a lot more (especially when they are putting in 60-80 hour weeks). People tend to forget that those NG troops that get ordered to the border are having to leave school or jobs (which are usually better paying) and they are having to leave their homes to live in some shitty hotel room or fuck-off field tent barracks. None of the college students (and college students make up a lot of NG members) are happy that they are putting their studies on hold because Abbott is desperately seeking Trump's attention. Those who had to leave decent jobs are sweating that those same jobs will still be there when they get back. Not to mention that if you have been in the NG for a while and you've been employed by the same company for a number of years and have done multiple deployments, after 5 years of cumulative leave for various deployments, your employer does not have to retain your job (and even if you're under the 5 year cap, there's all kinds of ways that employers can screw you over and still comply with the law).
I've done the NG thing, and granted it was in the 90s, and so it was quite different in some ways (I never fathomed being deployed overseas multiple times, etc.), but it was made up of a shitload of people who had a lot of solid reasons to join the NG and not the active-duty military, none of which were to sit down on the border for long periods of time.
And I live not too far from Camp Mabry, and my kids are friends with kids whose parents are at Camp Mabry in some capacity, and we have neighbors there, etc., and I've heard a lot of horror stories, and I'm not talking about the suicides/depression but people being stretched thin, having to work shit-tastic hours, etc. It's not a good look for the NG in general for a lot of younger folks who are looking at the NG, but fortunately for Abbott, a lot of NG soldiers have to stick it out either because they are trying to reach a certain number of years, or for college benefits, or any other number of reasons that have nothing to do with Abbott's desire to draw attention to Texas.
5 years from now, most of these people will have had the chance to separate or retire or go active duty, and you'll see a lot different NG.