I don't know about no reason. If it's a TEMS unit I'm assuming they're near the warm zone at incidents or at least has the potential to be. With a pain job like that it makes it much more of a target than a regular ambulance paint scheme. Criminals that're dealing with SWAT and just criminals in general aren't going to take the time to read the writing on the side of the vehicle they're targeting. Even if they did it looks associated with LE which may void the thought process of "oh they're medics they're not here to hurt me" and replace it with "they're part of the po-lice!!!!! Get 'em!!"
Just my opinion though.
With that said our TEMS unit is a dark blue cargo van. However they don't sit in or around it on incidents. It's just a giant rolling toolbox.
Hey! I don't only talk to you when life is full of lemons!
been busy lately with getting ready to move and what not. Sorry I haven't talked to you in a while though