The "Boomer" (Australian slang for a Large Male Kangaroo) is a Boomerang in the snipers melee slot, that allows him to fight on melee and distanced fights. The Boomer has a little bit less damage than the machete, but you can use it to throw it after enemies. The Boomer will follow the target until it hits his head or an object (like a wall or barrel etc.). The Boomer comes right back to you after you hit someone with it. But there won't be any difference between the melee hit and the distance hit and you can't melee while your Boomer is in the air. And it would be tricky to use another weapon, because you automatically back to the boomer after you catch it again. It's a good way to make finish moves on wounded cowards, who are trying to retreat.