Cal. Mil. & Vet. Code § 333

No claim shall be allowed under this article except upon vendors’ invoices or demand made quarterly in duplicate, signed and sworn to by the officer claiming the same, before any officer of the National Guard or Naval Militia, or notary public, and forwarded through the headquarters of the regiment, coast artillery corps, separate battalion, or next higher unit, or separate squadron, with the approval of each commanding officer through whose headquarters they are required to pass, direct to The Adjutant General.