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Do we need a Space Force?

The president has recently proposed that a new branch of the military be created, a Space Force. This is not the first time this issue has been raised. What concerns are being addressed by this proposition? What problems would impede the development of this branch? Who and what entities would this impact? Positively? Negatively? What impact would a Space Force have on the current operations of the Air Force?  Please, no discussion of alien invasions; that is too speculative.