Most security forces have a few variants (light, medium, or heavy armor), but they follow the same color scheme for each. You can see two examples of the Hurston Dynamics security force armor below that, while different, still follow the same color scheme. There are many other armor variations for each faction besides the ones pictured below.
There may also be unarmed civilians at mission locations, so be careful to avoid injuring them! Some of the unarmed civilians will be illegal drug makers and won't give you a crimestat for killing them, but as a general rule - if they aren't shooting you, then don't shoot them!
NPCs of Pyro and Nyx will be added at a later date