Why the MOU is the load-bearing document
Chaplaincy is the one role inside a public-safety agency that operates with real access and no rank. That combination only works when it is written down. Without an MOU, three questions have no answer when they finally get asked: what is the chaplain allowed to do, who do they report to, and what happens to what they were told.
Agencies usually discover this during an incident or an investigation — the worst possible moment to be improvising a scope of authority. The template exists so the answer is on file before the question arrives.
Before you sign anything
This is a starting point drafted from working agreements, not legal advice, and it is not jurisdiction-specific. Bracketed sections are there because your counsel has to fill them. Have an attorney who knows your state's volunteer-liability and clergy-privilege rules review it before adoption.
The reasoning behind each clause — why confidentiality is scoped the way it is, why the reporting line matters, where programs get into trouble — is covered in Chaplain with a Badge.