18 Mind-Blowing Facts You Never Knew About DOOM

3. Marine Doom

Doom was the first video game to be used as a training program by the U.S. military. A mod of the game, called “Marine Doom", was created by the United States Marine Corps to supplement the field training of recruits.

The mod was designed for a team of up to four players composed of a team leader, two riflemen, and a machine-gunner, to which they are to work together to complete a time sensitive mission. It was specifically used to train cooperation skills, reaction time, and split second decision making under high stress situations. Repetition of play was used to hone these skills until it became instinctive.

Marine Doom was eventually released to the public and replaced with America’s Army, which, unlike Doom, is an original game developed exclusively by the U.S. military.