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[.]").
James J. Hudson, "The California National Guard: In the San Francisco earthquake and fire of 1906." California Historical Quarterly 55.2 (1976): 137-149. online