Perpich v. Department of Defense, 496 U.S. 334 (U.S. 1990) ("The District Court rejected the Governor's challenge, holding that the Federal Guard was created pursuant to Congress' Article I, 8, power to raise and support armies[.]").
Pub. L.Tooltip Public Law (United States)110–181 (text)(PDF) Sec. 1812, Establishment of National Guard Bureau as Joint Activity of the Department of Defense