When building an Air Tower or wanting to build a primary Air support tower for the Tier two base in Global Conquest, you need to have Vertigo Bombers at your disposal to either attack both the Scrin or GDI. The Vertigo Strike is the support power used by four Vertigo Bombers to strike important targets belonging to the Global Defense Initiative and the Scrin, and these bombers must be quick to tackle their targets on the ground and escape GDI's AA batteries or the Scrin's Storm Columns and Plasma Missile Batteries being established at their bases. This support power from the Brotherhood of Nod only appears in Global Conquest.