There’s not much of a public reason to create a Space Force National Guard. That couldn’t be handled by forming a new section of Military Reservists. As State Governments wouldn’t be in a position to ever use the formations in their Space Capacity.

Which means there’s likely something else going on. On the more unrealistic side of things. Maybe it’s a hint that we’re going to adding states. Except these would be based on Mars or something. Which would necessitate the creation of National Guard Formations. Sooner rather than later.

Alternatively. It’s a way of cutting costs and reducing strain on Federal Budgets. By Forcing the States to maintain National Guard Formations they’ll never have a reason to use. So the Feds don’t then need to add more units to the National Reserves they need to foot the bill for. Allowing them to use the New National Guard as an unofficial Space Force Reserve.

This makes sense when you consider that the Space Force pertains not only to space operations, but also to the message traffic facilitated by space assets. They are the go-to force for issues of cybersecurity and cyberwarfare. A national guard for Space Force would be reserve forces.

That doesn't make sense to me but I'm not good at checkers much less 5D chess!