The army of Cobra is based upon the regular infantry troops, the Vipers. The original Cobra soldiers were many of those who shared the vision of their leader, Cobra Commander. Trained by soldiers-for-hire, they learned their skills to help establish footholds for Cobra in various unstable nations all around the world. As the organization grew, Cobra's army grew to include mercenaries, known international terrorists and disaffected soldiers from various nations, including the United States. The Vipers are either in it for the money, or for the continuation of Cobra's goal of world domination.