This has been discussed for a while:

US planning to create ‘Space Corps’ as sixth branch of armed forces

Basically, the current space-warfare functions of the USAF would be split off onto their own, in kind of the same way that the USAF was split off from the US Army shortly after WWII (though it seems the USSC would still be a part of the USAF). The reason for this would be to cement space warfare capabilities and funding; right now the Air Force could in principle take all the money needed for Space Project XYZ and divert it into a trillion-dollar effort to replace the F-35’s cup holders. If the USSC actually came about – and there’s every reason to doubt that it’ll actually happen, what with the whole idea being to kick over some current political fiefdoms – then it would have its own budget that couldn’t be raided for fighters or bombers or the like.

While I’d love to see the USSC come about and promptly start patrolling the spaceplanes with Enterprise-class 4,000 ton Orion battlecruisers, the reality is that the USSC would largely spend most of its time futzing around with satellites and whatnot. However, if the USSC comes along, has assured political independence and a good budget… perhaps the US military might finally start doing what it should have been doing since the 1960’s: setting up bases on the moon, sending military recon missions to Mars, weaponizing asteroids, that sort of thing. We shall see.