The Apocalypse in Another World: I'm the Commander-in-Chief

What would you do if you transmigrated to a country much like Earth, in the middle of an apocalypse, and happened to have a gaming chip?

Find survivors, protect the good, and kill the bad.

Note: The protagonist's troops are armed, and their weapons will gradually grow more powerful. The story starts with Call of Duty 5, then moves through 4, 6, and 8, followed by Black Ops 7. (The author likes these four games, so writing about them makes it easier to get immersed.)

P.S. If you enjoy the story, join the group: 241716781 (main group).