Out of 46 necessary unit replacements, most have been completed. Units still requiring replacement:
USA Medical Humvee
China Nuke Battlemaster
China Listening Post
China ECM Tank
China Dozer
USA vehicle drones
Other non-build-able vehicles that have yet to be replaced:
Chinese bomber for carpet bomb and EMP bomb
GLA bomber for Tox Bomb
USA B-52
Once these are all complete, work can start on the UI and buildings.