The Hell Walkers

The "Hell Walkers" was the name given to a US army squad during the vietnam war, its members having been around since the start of the war or even bofore, having seen much of the conflict's most brutal battles, the members of Hell Walkers have all but been driven mad, with a lust for blood and lack of any true morals. Their skill in battle is unmatched as the only Hell Walkers to survive are the strongest.
They were given the nickname "Hell Walkers" because of their involvment in such bloody battles of the Vietnam war, and would continue to do so until the war's end.