In Quantico, Virginia, in 1995, a project officer in the Marine Corps Modeling and Simulation Management Office named Scott Barnett created a modification called Marine Doom—complete with realistic military soldiers, barbed-wire fences, and marine logos. The game was perfect for training real-life soldiers in teamwork, Barnett’s supervisors agreed. Barnett contacted id, who gave their blessing, though they thought the idea of someone using their game to train soldiers was a joke. But it was the real deal. The game made its way across the Net and would be used by the marines for years.
