Weapon System in Zombie Apocalypse Novel

In one fateful day, the world has suddenly turned into chaos as zombies appeared from every major city on the planet. Millions were killed each day and the world government collapsed in just a month. Just as the world was about to lose hope, one person, Thomas Estaris, awakened a system that allows him to summon weapons like pistols, assault rifles, even heavy weaponry such as tanks and helicopters.Will he be able to save the world from its destruction caused by the zombies or die trying?