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Combat Barriers are placed and situated all around strategic locations as defensive mechanisms against enemy weapons flanking fire. Several types of barriers exist, but all are made of thick battle plating, presumably made of titanium or titanium-ceramic armor. These barriers cannot be moved or be deployed.
Combat barriers are used to protect soldiers of all types that are located in bases, dug-in fortifications, and other facilities (such as ships). While they are almost impenetrable to plasma and projectile weapons, they do not protect well against the concussive force of an explosion, though they do a good job of absorbing shrapnel and flying debris. In gameplay, they are "invincible."
Some Combat Barriers work by manipulating lines of sight. They have a small slit or corner for someone inside to shoot out of and have full line of fire on his enemies, but the enemies must hit a very small target. Combat Barriers in Halo 3, however, lack these slits—combatants using them for protection must stand up or creep out from the side to fire on an enemy, exposing themselves in the process. Beside the more common barriers made of metal, the UNSC also uses large concrete barriers.