After the Industrial Revolution Europe developed technology for hundreds of years, the founding of the new China is only a few decades. In the ordinary science and technology industry, we need to bury our heads to catch up; in the high precision end of the field, we need to bend to overtake the car. As a technician who had struggled for decades in the military industry, Xie Kai was reborn and returned to the days that had changed his life and the lives of many others. In this life, he did not intend to accept his fate again, but used his knowledge to make people around him change their fate, and it was this change that made the Republic's military industry achieve a bend in certain fields in advance, and also catch up with the European powers in most fields. Tanks? Rocket guns? Missiles? Advanced warplanes? Nuclear submarines? Aircraft carrier? All have nothing to do with Xie Kai ah ...... foreign technology embargo? Embargo? No problem, let's find a way ...... want Chinese weaponry? This thing ...... money are good to talk ...... Xie Kai is what? He himself can't figure it out. He only remembers that he is a military industrial son!