I've been thinking about doing this for a while. My philosophy for EIR is that each side should be mirrored yet different.
US, Wehr, Brits and PE would all be laid out like this
Offense - Has abilities that benefit units on the move and breaking defenses.
Defensive - Has abilities that benefit units standing still and beating offenses.
Balanced - Has a bit of both but has less passive abilities than off and def.
So here is how I would do it.
Americans
Airborne - Offensive
Infantry - Defensive
Armor - Balanced
British
Commandoes - Offensive
Royals - Defensive
Engineers - Balanced
Wehrmacht
Blitzkrieg - Offensive
Defensive - ...Defense :|
Terror - Balanced
Panzer Elite
Tank Hunters - Offensive
Scorched Earth - Defensive
Luftwaft - Balanced
Now to explain it a bit more.
Offensive Companies - Would have abilities like 33% movement speed, acceleration, abilities that work best in enemy territory, abilities that are quick strike and end just as quickly and don't saturate an area, i.e. dont attack more than maybe 3 units at a time (bombing run falls into that, precision strike, etc) would have abilities like blitzkrieg, operation overlord etc, but would penalize you or at least not benefit you if you sit still and wait. Not saying you can't but you wouldn't be using your company at its full advantage if you play a defensive style of game.
Defensive Companies - Would have off maps that can only work in your territory (rocket arty would be strengthened but only work in your territory) and saturate an area, defensive buffs in cover and in your territory, buffs that make your support teams and vehicles (mainly pe) better but wouldn't help them on the move (this is for pe
)
Balanced Companies - Would have more unit unlocks (like armor and luft) clickable abilities (terror) or both (engineers) and have a little of both of the offensive and defensive type bonuses although would exclude things like movement buffs, enemy sector bonuses and cover/friendly sector bonuses but be more general but wouldn't be nearly as good. So like say there's an offensive bonus for Blitz that gives them 25% more damage in enemy territory but 0% more damage in friendly, for Terror, you could have an ability like that but it only gives say 10-15% in all sectors.
What I plan to add on next is go through every doctrine and change things around, add or take away abilities that don't fit that style of game-play.
Also, all offensive, def and balanced companies wont play like another side, they wont mirror but the abilities and buffs that they'd gain would benefit that type of game play but would be tailored for the type of units that each side has.