Okay, here's the deal, some kind of aliens are invading Earth, and triggered a bio-weapon against them, destroying most of the plant life on Earth. I'll have a more detailed story later, but for now, here's the color schemes.
Human military (International Defence Force): Black with orange highlights and orange cockpits. Non-energy weapons and every kind of vehicle you can think of. no Anti-gravity except in star ships. They do have energy shields.
Human civilians: Pretty much any color, but uniform, no multi-color. Civilian vehicles are modified with weapons and armor. These are issued by the military, pending license.
Aliens (Krajj): Black with lime green highligts. Bright green cockpits. Anti-gravity is commonplace. Energy shields and energy weapons are also common. They also use walkers. Now get out there and build!