The California State Military Reserve (CSMR) is the state defense force of California, and one of three branches of the Active Militia of the State. The military reserve was formed to provide California a trained and organized military force in the event of a state security emergency when the National Guard is deployed. Its current mission is articulated in CA Military & Veteran's Code § 550:
"... as the Governor may deem necessary to defend and for the security of this State ..."