Military System in the Apocalypse

Zombies suddenly appear all over the world, spreading rapidly in crowded cities. Within a day, national governments collapse all around the world, leading to chaos worldwide. Law and order vanish, making people fear both zombies and each other. Despite the zombie threat, groups form and fight over the limited resources. But, amidst all of that, a man named Alexander received a system that allows him to summon troops, military equipment, weapons, and vehicles. With his newfound power, he can protect himself, his comrades, his kin, and other survivors from zombies and rival factions. Mutated Zombies? Feel my Glock-19 Rapists and Pillagers? Taste my Ak-47 Countries who defy me? Look at my nuke