The Militia is codified in the California law and the US constitution.
Links are provided to the Library of Congress, and CA State Law
The "unorganized" or reserve militia is a legal and lawful part of the armed forces of this nation. It is an organization affirmed by the Second Amendment of the Constitution, US Constitutional laws, and California Law:
Title 10 Section 311 USC which states:
The classes of the militia are:
(1) the organized militia, which consists of the National Guard and the Naval Militia; and
(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia.
The Dick Act of 1903 HR 11,654 Section 1625 which states:
Every able-bodied male citizen of the respective States, resident therein, who is of the age of eighteen years and under the age of forty-five years, shall be enrolled in the militia.
COMPOSITION OF THE MILITIA
The militia of the United States shall consist of all able-bodied male citizens of the United States and all other able-bodied males who have or shall have declared their intention to become citizens of the United States, who shall be more than eighteen years of age and, except as hereinafter provided, not more than forty-five years of age, and said militia shall be divided into three classes, the National Guard, the Naval Militia, and the Unorganized Militia.
California Law Military and Veteran's Code Paragraphs 120-130
There is no ambiguity regarding the "unorganized" militia. It is not the National Guard or the state "select" militia under the governor,
or part of the "organized" armed forces of the federal government. It is literally the entire body of the armed citizenry.
Although the "unorganized" militia can be called up for lawful (Constitutional) purposes, it is not under the direct control of any state or political jurisdiction. It represents the authority and power of the people over the government and stands as the last defense of the citizens of this country against any domestic tyrants. Militias also do not need to wait until called for a natural disaster.