Ops. Are. Boss. If you can use them right. If you are in Voleria and have 2+ engs, use duals. Use rare for damage too. If you have 1 eng, use symbiotic armor with a gun and shield. Engs can just rev when you're pounded down so take as many scorn as you can to the grave. If you can only rely on one, use a shield and live to fight another day.