This article describes a feature in the first Apocalypse Rising
The Guardian Badge was the most difficult badge to earn before the hat update.
This badge's appearance was similar to the the Savior Badge but has two M4s instead of one, and is colored blue. Like its sister badges, this badge was removed on the Hat update.
"Awarded to those who kill at least 15 bandits without any aggressive kills, and survive 15 days."