USA in general is a "field" general, they are in the best situation with a lot of space and quick development.

USA Air Force now has a bigger variety for aircraft and helicopters. He is also changed to to give a new style of play because the Auroras are removed.

USA Army is a mix between a tank general and infantry general. They have well balanced tanks and well trained infantry.

USA Marine is a general which is the first to be deploy to full potential on the battlefield. They have weaker but more quick units which adaptable to many situations.