Thanks for the comments!
Im going with the Soviet ZIS, US P-38, and the Bismarch for my units (as those came with the game). These series im calling 1st on the bills, as I would like to in the future end up covering more OOB units used in the game. I think by 5th the set will be pretty cool. Little history on the back of the bills about the units.
I have a game this weekend, ill test out the bills, see if they are a yay, or nay. If the interest is not really there to read about the units in between turns, or no interest in the bills for that matter, then 1st series is as far as ill get lol.
All 3 fronts are done, now just the back which im going now (kinda designed the mockup at work), I want to get these printed tomorrow.