Cal. Gov. Code § 20039.5

Notwithstanding Article 5 (commencing with Section 20350) of Chapter 3, or any other provision of this part, “final compensation” for the purposes of determining any pension or benefit for service with the California National Guard with respect to a National Guard member means the highest average annual compensation that was earned during a consecutive 12-month period while rendering service with the California National Guard. The final compensation of a National Guard member under another retirement or pension system shall not apply to the calculation of his or her retirement allowance with respect to service with the California National Guard.