There are a few novels that meet your needs: 1. "After submitting the system, I became a national treasure by snatching resources." The protagonist had a system to obtain resources from the other world and help the country complete many missions. 2. "Unlimited Modification": The protagonist has the ability to modify various items, demonstrating the power of high-tech and futuristic technology. 3. [Military Reclamation of a Great Country: A story about soldiers and their children who contributed to the country.] I hope you like my recommendation. Muah ~