Space National Guard Establishment Act

This bill establishes a Space National Guard as part of the organized militia in states, territories, Puerto Rico, and D.C. where the Space Force operates, creating two distinct components: state-level "Space National Guard" forces and a federal "Space National Guard of the United States" that serves as the Space Force's reserve component. It defines these terms in federal law, clarifies their structure (including personnel requirements and status when not on active duty), and requires implementation within 18 months, with annual congressional briefings on progress. The bill does not create new missions or funding but formalizes existing National Guard roles within the Space Force framework.