Barricade

A Combat Barrier is an armored mobile ground fortification of the United Nations Space Command.

They are placed around strategic sites as defensive mechanisms against enemy weapons fire. Several types of barriers exist, but all are made of thick battle plating presumably made of titanium or titanium-ceramic armor. The purpose of combat barriers is simple: to protect soldiers and dug-in fortifications from the enemy. While they are almost impenetrable to plasma and projectile weapons, they do not protect well against the concussive force of an explosion, but do well to absorb shrapnel and flying debris.

The player can use barriers to shoot from behind, and then to duck as an opponent fires on them. Combat barriers can be found in a few levels in Halo 1, mainly on the Pillar of Autumn. They can also be found in many levels in Halo 2, primarily on Cairo Station and Earth. They also exist in several multiplayer levels in each game, such as Longest, Turf and Relic.