We are not spread thin. There are only 150K forces in Iraq out of 2.3 million. Supported by another 3 million civilians. And a fast industrial ramp-up of 5-10 million here. And on the right side of Iran there are some very silent bases:):) While they make noise on their left side.
I don't think we want to be in too many places at once.
Us pulling out of Germany was getting ready for something else as well IMO.