The year is 2055, more than thirty years after the events of Zero Hour, Earth suffers a catastrophic collision with meteorites. The world is thrown into turmoil as large swathes of land are annihilated. Four factions, the ADF (Asian Democratic Federation), WEA (West European Alliance), WLF (World Liberation Front), and AC (American Confederacy) are at war for control of the remaining already harder to find resources as well as the preservation of their nations and geopolitical interests. Welcome to Deep Impact.
Railgun Technology has been a long time in the works. The WEA has been researching this particular field for ages, but their research has especially stepped up since the dismantlement treaty went through. This research has produced a new weapon: the Railgun Tank. Capable of sending a single tungsten shell through small targets at extreme range, its only serious downside is that once the vehicles capacitors have been discharged, it takes a fair amount of time for the system to be prepped to fire again. The brand new reactor has also had... questionable... safety results. Yet there's no time to delay, and these tanks are being rushed to the front line as fast as possible.