EDIT: Nedim, there is NO WAY the USA should have so large of an army. After WW1, the majority of the army was immediately disbanded within a year or two, and throughout the '20s and early to mid '30s we had a relatively small army. Plus, the equipment was essential not updated in any large way until mid '30s so modernization shouldn't be as high as other powers either...
And I would say the UK should probably be more powerful EP wise, and Germany be weaker EP wise as well. Germany is still paying reparations and if I'm not mistaken, either the french occupation of the ruhr is happening, just happened, or is about to happen. They aren't in a good situation for the next couple of years, nor for the past couple.