All the branches are pozzed, and heavily so. I say this as an outside observer who has never served, but you don't have to be inside a burning building to see its on fire and being destroyed.
About the only area that seems non-pozzed in the ultra-special forces dudes (SEALs, Berets, Recon, etc.) but good luck getting into those.
The only reason to go in would be to get some military training (however inadequate and poor it offers today), learn a trade, get the G.I. Bill, meet with some like-minded folks (they are there) to develop post-collapse connections, or to get the shine for a political career.
Picture the American military like the Roman military in 400-470 A.D.: People joined to exploit the system, not to serve Rome. The Roman army by then was crappy, far over-extended, corrupt, living on the glories of the past, too interested in promotion for non-valid reasons, demoralized, weak, and heavily dependent on mercenaries.
That last bit is important; the Western Roman Empire in the last century relied on Gothic and German mercenaries to deliver any real military wins. And then those mercenaries turned on the empire and it collapsed into petty Gothic kingdoms.
Right now a lot of the grunt work in Afghanistan and Iraq and other places is done by mercs we hire. Blackwater (which changed its name) was a big one. They call them military contractors but they are mercenaries.
Yes, we have special forces and ordinary duty guys doing great things out there, but half of everything being done are paid mercs with no loyalty to the military or government. That will not last long and they will either leave when the pay goes away or turn on us.
Now, many of the mercenaries were regular soldiers first and then were recruited after their discharge, so maybe you might want to go that route. But otherwise, if you join, keep your head down, get the training you want, and get out. Or you may want to get in, and then get discharged and become a military supplier using your connections, those seem to work out well.
One place I might recommend would be Space Force. Since its new, its probably the least pozzed.
P.S. I sometimes feel bad I didn't serve, but when I looked at the diversity-filled, affirmative action promoting, gay and tranny loving, women in the military, anti-white nature of the U.S. military today, I realize that I made a good choice. I do not want to support that kind of world.
