There are many forms of camouflage, each used for a specific environment. The UNSC Marine Corps seem to utilize a type of Woodland Camouflage after the events of Alpha Halo, and appear to use a variant of the Desert 2-colour pattern by the Battle of Installation 00. The Orbital Drop Shock Troopers utilize urban camouflage during the discovery of the second Halo installation. Also, during the Fall of Reach , the UNSC Army used various forms of camouflage, among them are solid color olive drab and desert tan.