Iron Marshal of the End of the World: My Army Can Be Upgraded

[The end of the world + single female protagonist + explosive soldiers + zombies + red-eyed chicken plague + system + evolution + army + golden finger] A sudden "red-eyed chicken plague" virus swept the world. Infected people will have red eyes and behave violently, like zombies, but more animalistic and primitive aggression. In the apocalypse, human nature has declined and order has collapsed. Delivery boy Chen Feng awakens the "Iron-Blooded Commander System" in a desperate situation and summons a team of heavy armored infantry from the cold weapon era at the beginning. He discovered that the soldiers he summoned could not only gain "Command Points" by killing infected people and hostile forces to expand the army infinitely, but they could also consume special resources to make the army realize an era jump: from cold weapons to matchlock soldiers, to modern musketeers, to future mecha warriors! Let's see how Chen Feng builds his iron-blooded army step by step from an ordinary young man, builds the last high wall of mankind, gathers survivors, establishes order, sweeps away the infection wave, reveals the shocking conspiracy behind the virus, and finally becomes the only supreme commander in the apocalypse!