As it stands the USF vs OKW match up is quite largely unbalanced.
I agree with Corsin about US officers being given heavy weapons when they come onto the field is over powered. If the US infantry wasn't already super strong with instant suppression from the Rear Ech troops and rifleman being good at all ranges then maybe it would be fair. However as it stands this is not the case.
The USF can also field the M20 or the AA-HT track around the 5-6 minute mark and they are incredibly strong for how cheap they are. The fact that the M20 crew has a bazooka just makes the unit even more ridiculous. In my opinion it's armor should be the same as an Ostheer 222 scout car even with the skirts. As for the AA-HT it absolutely tears apart all light vehicles and infantry with no set up time at all compared to the OKW Flak HT which comes around the same time. Even the puma has to be wise around it as it does so much damage. Maybe a solution to this problem is add a set up time to the AA-HT and or make it weaker or perhaps slower.
Another suggestion to fix the balance could be putting the panzer 2 into tier 3 instead of tier 4. It seems incredibly strange to have such an average T-70 like tank in such a late tier where only the elite units should be.
Some serious adjustments need to be made to the flak-ht at any rate. It's setup time just makes it useless and will end up being the reason it gets destroyed. As soon as any armor or at gun gets eyes on it it's dead. This is because it will always get two 'shotted' as it can never pack up and run away in time. It's smoke ability will not do it any good against decent players either as they know how to use attack ground.
The USF AA must receive some nerf, obviously. My bet is that it will receive in the near future, for sure. The OKW AA is rather usefull even with that setup time. I could keep it safe due to that smoke throwing ability. What I didn't like is that ROF decrease...why? The initial stats were OK.
Related to Panzer 2 placing (in T4) I think the building concept of OKW forces is quite revolutionary, meaning that instead thinking the Tiers as specialised buildings that can spawn certain unit types for specific game's stages, almost every OKW tear offers you tools to deal (more or less efficiently) both with vehicles and infantry.
For instance: T3 - the AA deliver good AI damage, Puma works against light vehicles and medium tanks, the wurframen offers you a reliable range weapon.
T2 - infantry gun offers you a range weapon (good against infantry) and a powerfull AT solution;
T4 - offers you powerfull AI tools - PZII / obersoldaten, a powerfull tank - Panther and a mass distruction weapon - the SturmTiger.
Practicaly, T1 which you have it by default anyway + any other okw tier, offers you the oportunity to build a complete army, that covers almost every counter in the book. Which is a great concept in my view, and I wouldn't change that. What I would change, is creating somehow the option to directly build T4. Won't that be something