 The commander can place buildings, research upgrades and has a number of abilities to support their team (dropping health and ammo packs, using certain support units to aid in combat or building, or erecting walls to block enemy movement), at the cost of resources.Buildings in Natural Selection are designed to aid players in their offensive, defensive, stealth and speed capabilities.For a team to achieve victory, they must eliminate all of the opposing team command structures ("Hive" of the Kharaa, "Command Station" of the Frontiersmen).