Me and My Mechanized Army

Nuclear war broke out and the world became a wasteland. Zombies are rampant, alien beasts are raging, and humans are living in despair. Accidentally awakening the mechanized legion system, I directly summoned interstellar tanks, mechas, fighter planes, and heavy infantry! Others are still picking up rags to survive, but I have pulled up a torrent of steel. The tracks rolled over the zombie tide, and the artillery fire destroyed the alien beast's nest! From a tank to an army group, From a safe zone to a steel empire across the continent! "Report to Commander! A wave of millions of zombies has been spotted ahead!" "Everyone fire, plow them down!" This is a man with an invincible mechanized army, A passionate legend that sweeps across the apocalypse and rebuilds civilization!