Elite Combat Operatives (more commonly referred to as ECO) are Special Forces who operate as a part of the Systems Alliance Terra Corps. Elite Combat Operatives are the best warriors that has to offer. Along with being permitted to have gene therapy that stresses the laws of the Alliance and authorized to have the most devastating infantry weaponry developed by the Alliance, Elite Combat Operatives are given some of the greatest training possible to them which makes them even more lethal against their foes.