I’ll give you the green. That is unusual. It might be fair to add green to the list for some state trooper uniforms and park police uniforms.
I apologize if you’ve spent significant time in the US. I’m assuming you haven’t if significant variation in police uniform seems like it would commonly come up. The colors I mentioned are typical for city, county and state police. There are some variations, e.g., I said dark which could be black or a dark blue. To most people, the difference does not cause them to read the situation differently. When I review the uniforms of the 40-50 policing bodies with which I’m most familiar, I don’t see much deviation.
Security guards do try to mimic police uniforms as much as they can get away with, and I think that is dangerous. At minimum they should be forbidden from wearing a badge that looks like a police badge, and they should not be allowed to wear a hat that looks like a police hat. A security guard with a baseball hat, no badge, and their firm printed on their uniform is not easily mistaken for police.