Doomsday Red Alert System Starts with Loans to Build Tanks

Not the Holy Mother-Red Alert System-War When he woke up, Ling Han found that he had traveled through the apocalypse. Facing a world where zombies are rampant and mutated monsters are raging, he activated the "War Empire System". You start with an ax, and the resources you start with depend entirely on loans. But soon, Ling Han discovered that this system was not simple. Not only could it explode troops, it could even upgrade the technology tree and unlock star battleships! While the other survivors were still fighting for a piece of bread, Ling Han had already built a steel city wall. As various forces competed for territory, his legions were rolling over the ruins. However, with the emergence of unknown threats such as genetically modified monsters, Ling Han realized that this wasteland was far more dangerous than he imagined... Here is a stack of armor first [It is not a 100% Red Alert, but a unit based on the Red Alert, there will be some changes] [The exciting plot probably takes place after the protagonist leaves the base, I hope readers can stick with it]