I don't play COH2 only stalk the forums and streams so I need some help. I remember Ami mentioning Wehrmacht Elite Troops was banned from OCF because the Tiger Ace call in is against the spirit of the game and practically an auto win button. But haven't heard/read anything about why the other commanders or all bulletins are banned (also what are bulletins...).
Banned Commanders:
USF Rifle Company
The British Forces Special Weapons Regiment
The British Forces Vanguard Operation
Wehrmacht Elite Troops