Is there a historical event that you are trying to replicate? B/c other than Kasserine Pass in North Africa, I am struggling to think of a battle (much less a campaign) where all green troops (US) were the norm? (Granted...I am not a very thorough military historian)
And I am not sure how using (only) them will improve my tactical skills?
Don't get me wrong...I am not one of those "Wehrmacht fan boys" who only wants every battle to be another Kursk, so they can have King Tigers and every other exotic vehicle. I have no issue with "strict rarity" rules, or other setups, that replicate a historical battle. But running around with poorly performing troops just to "see what happens?" isn't something that appeals to me. Sorry...