UNIT - WEAKNESS Tactical Nukes - ILA Mobile GTA ILA Mobile GTA - US Stealth Bomber ALL Boats - ILA and US subs ILA and US Subs - Sub-hunter Helicopters Infantry - Anything on wheels (run them over)
Enable the "Full supply" and "No fog of war" codes, then click on US headquarters. Build it next to a building that is included with the level. After that, build whatever you want, but keep them away from the US headquarters that you built. Then, build a nuclear silo and launch a nuke at the building next to the US headquarters that you built. Repeat this until you run out of everything in your inventory.
