USF when play 1v1 against ost.. Mass RE to gain map control use volley to fight off cutoff grens and rush for AA HT and rush it to enemy base before he build T2 building
(usually ost player don't go T2 that fast, most time when i reach german base they are building T2)
as i always go walking stuka first as OKW not flank HT, also i don't use obs anymore since nerf, i use Fallschirmjäger and keep in distance to fight enemy infantry, also airborn assult is great to counter a big blob and force them to retreat, if they don't retreat my mighty stuka rockets will land on them. (if they retreat before my stuka fire i will fire at base if it is 1v1 or 2v2)
Ost my favor commander is LeFH 18 art with sector artillery pretty much use in 2v2 and 3v3 all the time, although the LeFH got owned by 120mm precision strike, B4, and USF priest pretty hard, but i still love them and i usually never target it to battlefield when playing 2v2, always bombing the enemy base, wipe alot sq from it and destroy buildings is fun too. and sector artillery when use right is very suppressing to enemy, I use to throw flare into woods of the sectors, so other side won't realize until art hit them.