Vipers are seen working closely with Dreadnoks in Cobra's first push to revive in seven years.  They then work closely with Iron Grenadiers . In a push to claim power in America, Cobra forces have used microscopic nanites to attack everything from communication systems to random citizens. Vipers and Cobra allies are presented as "saviors", but they are simply outright killers, for example they murder every member of a US National Guard relief convoy and distribute the supplies themselves.  Vipers are part of the forces that march on the White House , which is defended by a multi-military effort, including several Joe soldiers. The Vipers kill multiple Joe rookies (collectively called " Greenshirts ").