The US army does one thing really well in Flames of War when running an infantry list, and that would be artillery
I'd start with a couple (or three) basic infantry platoons and then load up on arty. 1-2 batteries of 105s, a battery of 155s, an AOP and then fill in the rest with what you want.
Some tanks wouldn't hurt but be warned US armour in late war is really fragile.
Picking up the book 'Turning Tide' should be your first port of call regardless of what you do. 'Fortress Europe' would also work if money is tighter.