This (fictional) manual details “the primary doctrinal reference on conducting fire team sized infantry operations in a Zombie infested environment in the United States.”, care of Army Zombie Combat Command. The topics contained within include how to identify the undead or soon-to-be undead, effective weaponry and tactics against the undead, and other similar topics, all zombie-related. It’s a pretty solid guide, and since it is free and all there’s no reason not to give it at least a quick peak. A word of warning, though: the creators are definitely familiar with the works of Max Brooks, frozen zombies and all.
It’s pretty good and funny, though I wish they put a little more attention to detail in the final product as well as using more of an “Army” writing style.