A report by the Congressional Budget Office indicated that the creation of a Space National Guard, as proposed by the National Guard Bureau, would cost an additional $100 million per year in operations and support costs, with a one time cost of $20 million in the construction of new facilities. This report directly contradicted the statement by the National Guard Bureau that a Space National Guard would only have a one time cost at creation, and then be cost neutral.[1]
The report also analyzed the cost of the creation of a larger Space National Guard, which would be ~33% of the Space Force, calculating that the annual operating cost would be $385 million to $490 million per year.[1]