Below is the excerpt from our policy, and attached is the form. Hope this helps!
In order for a sworn member to carry a personally owned firearm while on or off-duty as a back-up/secondary firearm, the member must submit a “Request to Carry Personally Owned Firearm As Back-up/Secondary Service Firearm” form to the Training Lieutenant for approval. The member must then show proficiency with that firearm prior to being authorized to carry it. (CFA 10.10B)