Well there's always this website:
http://www.citizencorps.gov/
...which is linked to Volunteers in Police Service:
http://www.policevolunteers.org/
And they have a link to our very own Sheriff's Posse:
http://www.policevolunteers.org/programs/index.cfm?fuseaction=dis_pro_detail&id=254
...of which I am a proud (armed) member. I would urge people to contact their local law enforcement agency rather than starting a separate program and trying to make the police department accept it. I never thought of myself as a law enforcement volunteer, but after joining up and being trained and working some details, I almost wish I had gone into full time law enforcement many years ago. It is very rewarding and lots of fun.
There are enough former veterans around that we could easily staff a gigantic force of volunteers if we really wanted to. The lefties would cry about "vigilantes" or whatever. Let 'em whine.
The only way I know of to become a "former" veteran is to die.