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I'll address your points one at a time.
"(USF is the only faction that gets a free unit when they tech up.)"
I dont get your point. UKF is the only faction that gets free howitzers when they tech up. Okw is the only faction that gets an anti infantry turret when it techs up.
"(WAY Too OP. A six man squad with M1 Garands, BAR and a Zook? With smoke grenades and sprint and sight? There's literally nothing OST or OKW has to counter that. Obers couldn't even live to survive against something like that vetted. Not too mention what would happen if they went double BAR.)"
As compared to a 6 man squad that isn't limited to one on the field, has 3 g43s, long sight range, vet sprint, flares and a long range AT grenade without needing vet?
Look adding a rear echelon model or a pistol wielding officer model wouldnt be a gamebreaker and rifles already have doctrinal sprint. Sure the smoke is something that got removed from them but that was because people would run 3-4 rifle squads and just spam it. I'm only proposing upgrading a single command squad like the command vehicle upgrade for brits. The only difference is that instead of providing aoe buffs, it just improves the combat capability of the unit designated.
"(So in a close game that goes below 200 mp, you propose that USF instantly calls in armor that can roflstomp P4's alongside Jacksons with no fuel penalty to call them in?)"
What i am proposing is very similar to heavy tank callins. A late game hail mary. The difference is that E8s aren't really a unit you can bank on in the same way that you can bank on a heavy tank to do the lifting. Also no heavy tanks have a limited number of callins-not anymore.
Basically you are saving 70mp and 15 fuel(normal E8 is 390mp 140fuel) in exchange for not being able to call these tanks in until the 30 minute mark despite the fact that if you paid full price with rifle doctrine, you could have them at less then 15 minutes.
"(Fun for you. Meanwhile my hair is turning grey at the thought of Bar/Zook 6 man Rifles with Grenades, AT grenades, Smoke, Vision and Sprint. Its like some rich guy walking into McDonalds when he wants to order from the menu and says, "Lol yeah, I'll have ALL the menu.")"
I am not suggesting all rifles get a 6 man upgrade. I am suggesting a command squaf ability.