[ShelledPants]

Green and Tan are the two major colour identifiers for opposing teams in a MilSim environment. Black / Blue / Grey etc will get tagged onto what ever team identified by the host. Some games stipulate you must wear a certain colour and that other colours are banned.

Best bet, go buy Woodland and Desert Marpat. These two will ensure you can join either side of a game you want to play at.

Black is rarely used outdoors due to it creating a void in darkness, and lack of blending in nature. But to each their own.