A surface-to-air missile battery was an upgrade for the component tower. It was a major part of GDI defenses during the Second Tiberium War. The SAM Upgrade provided GDI bases with effective anti-air cover.

These were constructed through out GDI bases as their main means of anti-air defense. They had to be protected from ground threats however. The new AA Battery replaced the SAM upgrade, as it was cheaper and easier to maintain.

v·d·e Global Defense Initiative Second Tiberium War Arsenal

Units Infantry Light infantry • Jump jet infantry • Field medic • Disc thrower • Engineer • Ghost Stalker • Riot soldier (campaign only) Vehicles Amphibious APC • Wolverine • Titan • Hover MLRS • Disruptor • Mammoth Mk. II • Harvester • MCV • Mobile EMP • Juggernaut • Mobile war factory • Limpet drone • Mobile sensor array • Hunter-Seeker droid Aircraft Orca Fighter • Orca Bomber • Orca Carryall • Orca Dropship • Orca Transport Other Mammoth tank (campaign only)   Structures Production Construction yard • Tiberium refinery • Barracks • War Factory • Mobile war factory • Helipad Support Power plant (Power turbine upgrade) • Radar station • Service depot • Tiberium silo • Upgrade center • Tech center • Orca Command (cutscenes only) Defenses Gate • Pavement • Component tower (Vulcan/RPG/SAM) • EMP cannon • Firestorm generator • Firestorm wall section Upgrades Ion cannon uplink • Drop pod control plug • Seeker control Cut content Dropship bay   Other Misc. Kodiak • Searchlight tower Support powers Ion cannon strike • Hunter-Seeker release • Drop pod release Items in italics are exclusive to Firestorm

v·d·e Forgotten Second Tiberium War Arsenal

Units Infantry Mutant Soldier • Mutant Sergeant • Mutant Hijacker • Mutant Sniper • Ghost Stalker • Tiberian Fiend Vehicles Attack buggy • Attack cycle • Wolverine Mk. I • Artillery • Harvester • Mammoth tank Aircraft Harpy   Structures Production Construction yard • Tiberium refinery • Barracks • War factory • Helipad Support Power plant • Advanced power plant Defenses Laser turret • Component tower (SAM) • Obelisk of Light • SAM site Items in italics are only used in Firestorm