Sorta related to Valcom, sorta not, but I'd rather lump a few questions into one thread instead of cluttering the forum with a bunch of threads.
1. Valcom PD users identyfing themselves: What's the first number? I know the second character, the letter, is which department they're with (except for the K-9 units). I'll hear things like 1 Adam 3 or 2 Adam 16. I know some agencies use the first number to designate the shift, but I think I've heard numbers higher than 3 and 1's between 2200 and 2300.
2. This is mostly related to Auburn. My neighbor got TP'ed over the weekend and for some reason wanted a police report. I snapped a picture of the car (because for once it wasn't moving).

A-23 and 23G; what do they mean? I'd guess that A-23 is Auburn's 23rd car and it's on the roof so that helicopters and such can identify cars from the air. 23G means it runs on Gas...?
3. Do all unmarked cars have XMT plates? City, county, and state units? My dad has told me he's seen tricked out Civics having a car pulled over on I-5 but he couldn't ever recall what the plates were like.
4. I know AMR does BLS transports for South King Fire. I know they're never first on scene. They're basically like a taxi but more expensive and for sick people. So who does the ALS transports? Are there rules/laws/regulations/procedures/protocols that state when AMR goes lights & sirens? I've never seen a unit outside Seattle with its lights or siren on.
And an unrelated side note: I know that at least some of the AMR vans have CD players in them. You can tell when they're still on duty because when they come into your store at least one of them has a portable in their hand the entire time and everyone and a while they'll take off running. Hey, they've got 10 minutes to get to the call, and if it's a slow period I don't blame 'em for shopping instead of sitting in the van watching traffic.