Duty Calls was created for marketing purposes to promote one of Epic Games new games, Bulletstorm. It was meant to parody Call of Duty and includes many cliches from many other FPS games.

It takes place in Kemerovo, Russia, and focuses around single soldier's attempt to retrieve the nuclear missile-bomb from Leader of Bad Guys. On the way, the player finds many useful items such as a "meaningless stick". He also goes up through the ranks of the military through hard work and devotion to the cause of which you are fighting for. The plot is immensely better than any other game that has been made and truly astonishes players to this day. Throughout the game, however, the game makes jokes about military roles, like: "Sergeant Sergeant Master Sergeant Shooter Person."