Thanks for all your help people!
Good links all...
USA units will be (not a complete list)
Engineers
Infantry
Special forces
F16 (still a few...not buildable anymore though)
F22
JSF
B52
B2
M1A2 tank
Because technology will play a part in this scenario you can ofcourse research new units. The technology of exoskeleton will upgrade regular infantry, while adv. communication will upgrade the special forces. I don't know what the next line of fighters will be, but the B3 will be a researchable bomber.
Suggestions are welcome, especially about tanks and other vehicles and ships.
Here are my changed infantry units: