Scorpion 6 Knives
In the US Army, units and individual teams are given call signs to avoid giving away identities over enemy radios. The number after the call sign signifies your role within the unit. The number 6 is the command element. In an elite Army Infantry unit, call sign "Scorpion" roamed the mountains of Afghanistan looking to make friends with the locals. This is where Scorpion 6 came from.