LAB is fine.
CPIV is getting reworked
As far as OH abilities goes:
Units arriving in bundle are not generally good so i would just remove the Gren/PG from the 250HT.
MAYBE the Gren version makes a little more sense in the Assault Gren commander.
Relief infantry.
Osstruppen reserves where always "eh" even in Mobile defense meta.
Not sure how shitty is the Stuka flame bomb barrage
I do hope they don't give Mechanized Assault the straight up 250 from Infantry though... I feel like the clown car cheese with early Ass Grens would just be toxic. +1 To Relief Infantry and Stuka Flame Run getting fixed. I would also suggest reworking the medical crate drop - maybe reduce the cost and have it drop one crate. Dropping 3 crates is too hard to use near the frontline because you rarely use them fast enough to not run risk of them getting stolen and dropping them at base is pointless when it's much more efficient to build a healing bunker. Med kits are also omni-present in OST and dirt cheap now... so you really need to work the buff angle to make the ability usefull.