This bill establishes the Space National Guard as the reserve component of the Space Force , operating as part of the organized militia in specific states including California, Colorado, and Florida. It is designed as a federally recognized space force, trained and equipped partly at federal expense, with its officers appointed under constitutional provisions. The new entity will be led by a transferred Director of Space Operations and will incorporate existing staff and specific Air National Guard space units from the designated states. The legislation strictly prohibits the assignment of any additional personnel, including general officers or staff, beyond these specified transfers, ensuring existing state structures oversee these units. The Space National Guard is mandated to utilize existing facilities, infrastructure, and installations currently used by the Air National Guard for space operations, with no new construction permitted. The Secretary of the Air Force and the Chief of the National Guard Bureau must implement the Act within one year and provide annual briefings to Congress for five years on its status, missions, personnel, and budget. Finally, the bill includes comprehensive conforming amendments to Titles 10 and 32 of the United States Code. These amendments integrate the definitions of "Space National Guard" and "Space National Guard of the United States" into federal law, clarifying its status as a component of the Space Force when in federal service. They also outline its composition and administration when not on active duty, ensuring legal consistency across military statutes.