I think it's about time the U.S. abandoned the idea of an invasion type force to rely more on its electronics and unmanned capabilities. If my drone can remove a foe from five or ten thousand feet then why do I want to expose a dozen men looking for the whites of another guy's eyes?
I do think the U.S. should maintain a homeland force for those things that the National Guard is sometimes called upon to do, including re-inforce the borders. But I also think the U.S. should hire (build and maintain) a civilian mercenary force with Seal quality abilities for those occasions where a stealth assault might be the only alternative.
I think this force should be trained and maintained in a border agreement with Mexico. That is, this force agrees to maintain the U.S. - Mexico border from the Mexico side. The intent would be to stabilize and support the border villages and communities while diminishing the violence and illegal imports across the Mexico-U.S. border. And of course the creation and maintenance of a mercenary force outside of U.S.legal jurisdiction.
This mercenary force could be funded in part by U.S. defense spending as well as by other countries which would hire this mercenary force in lieu of the U.S. Army for those activities the U.S. Army might typically perform for those other countries.
This could help to reduce U.S. defense spending while also reducing librul whining about anything military. A good place to originate this force would be east of the Texas Big Bend, near Amistad Reservoir (water training). But ultimately at several points along the U.S. Mexico border.