When you see CAS in Ostheer's loadout, hold out on picking a commander until you are sure he has CAS, and pick either Guards motor coordination or shock rifle. Both deal with CAS really well in terms of ignoring strafes/strikes and blowing up the infantry Ostheer spends munitions on.
Its the only alternative commander other than a commander with a tiger/elefant.
I have counterattack tactics centered bulletins in my loadout to fool people into going CAS, and they later get crushed by T34/85's or IS-2's.
As for USF, do what USF does best.
I use CAS a lot so let me break it down:
CAS is primarily used for (at least in my case) to counter Artillery happy allied players.
The JU-87 and its 37mm AT strafe is one pass and a skillshot and has a very long cooldown
(I believe its 80s)
This being the case unless your tank is right on the edge of the map you normally wont have trouble dodging it if your micro is at least decent.
In team setups however, It is essential to have to prevent B-4 spamming cheese.
The AI strafe is IMO the strongest part of the doctrine as it lets you spam LMG's and win every engagement vs US rifle spam. While this is a cheesy solution It is currently one of the only effective ones as boxes are now not worth the doctrine choice if you discount the OKW fuel boosting.
(Also a cheese strat)
This is the only Wehrmacht doctrine that gets a AI strafe other than Assault support and that is also now a joke due to the nerfs to the Opal truck and tiger just not being the tank it used to be.
Fuel to muni transfer is the same as its always been, You are cutting tanks on a faction with already high fuel costs.
And finally the effective stuka dive bomb.
At the end of the day When playing on a team you must have it equipped for B4's or Arty spam.
Shock rifle frontline counters this very well, As well as good kat truck play.
ISU-152 if cared for properly will absolutely shit on this as he wont have many tanks if any.
If you must infantry blob vs this, the AI strafe can be dodged so its not a auto win 1 click like the
Opal one is.
For USF Scotts work great, As well as bulldozer Shermans. HE Shermans can work too.
And demo's are generally very effective vs this type of play.
So gimmicky and unfun to play against.
FHQ and B-4 in team games are very unfun to play against as well when you don't have proper counters at your disposal. Especially against a coordinated team. The fact that B-4 Has the potential to 1 shot a JT,KT,TA is broken since it has precision strike and is smokeless.
Wish LeFH was even close to being as good since it costs the same its kinda a joke.
CAS AT strafe will destroy any arty effortlessly
This is also correct the 110 MU 37mm strafe will 1 shot Fixed guns 95% of the time (It can fail due to it being on a weird hill incline or behind trees or a building)
Shock rifle frontline and Shock motor heavy is the counter to CAS.
Don't blob so hard; The JU-87 7.92mm strafe is a skill shot.
And move your kat trucks when you see any planes. and keep the kats spread out.