Reborn in 1981: My Tech Tree Went Off the Rails, and the Rabbits Went on a Rampage

[Sci-fi + period piece + technology + wish fulfillment + rise of a great power + rebirth] Qian Tianrui is reborn in 1981 and, at a moment of crisis, appointed director of the 081 Military Factory. Amid the tide of reform, he swims against the current, determined to become the leading man of his era. Qian Tianrui: “Catch the wind, and even pigs can fly.” Does developing the economy mean you can't develop the military industry? Qian Tianrui: “I'll do both!” Afraid of not having enough firepower? Qian Tianrui: “Then I'll cure you with one new weapon after another. I have experience in this.” Starting with a heavily modified Hell Cannon, he sends the entire tech tree down the wrong path! Have you ever seen a grenade launcher with a range of two kilometers? Have you ever seen high-speed suicide drones that fight in swarms? Have you ever seen hypersonic missiles?