5-68. Screen and guard missions can be forward, on the flank, or in the rear of the main body, and they can be moving or stationary. Moving flank guards must also conduct a zone reconnaissance between the main body and the guard force to prevent bypassing significant enemy forces. The screen, guard, and cover security tasks, respectively, contain increasing levels of combat power and provide increasing levels of security for the main body. However, more combat power in the security force means less for the main body. Also, commanders should incorporate signature reduction techniques into local security plans. Area security preserves a commander’s freedom to move reserves, position fire support assets, provide for mission command, and conduct sustaining operations. Local security provides immediate protection to the friendly force. (See ADRP 3-37 for more information on protection.)