As with all long-running manga, the mangaka intentionally forgets what modern technology and strategic thinking can do. Leilei can be tracked down with a lot of things outside of GPS tracking. And another thing which doesn't get much attention is how many Japanese citizens are being murdered right now. Wouldn't they use the "real" army equipment for cleanup? I don't know if Japan is using thermal reconnaissance drones, but at least they should have Type 90 / Type 10, Type 98 to do it quickly if they plan to pull out withdraw afterwards. (as i understand they didn't use them from the start cause they are needed on the japanese borders)