I'm not sure how I feel about nerfing the SU-76. I get that it's a standardisation, but that unit's hardly meta.
I think it just needs some sort of other buff to make it actually useful. It's as much as a puma but it kind of just sucks.
Airlanding officer unit seems like it's going to be pretty mediocre for being only limited to one. Coming at 4 men as an smg squad at platoon cp timing is sort of just meh, and commando stens aren't a crazy good weapon without camouflage. Seems like they'll just be kind of worse pgrens but limited to one. I'd toy with maybe increasing the limit to at least 2, 3 at max so they don't just get spammed.
I think lategame they'll be fine, and may possibly be kind of OP if they keep the elite brens, which should probably be removed, but they seem kind of mediocre at what they're actually supposed to be doing (filling a cqc role).
Also cromwell is kind of garbage. Could be worth buffing.