"Research has demonstrated that some game design choices improve the way people focus and increase feelings of well-being. Other design choices can trigger addictive behavior. While research is ongoing, experimental studies have shown that some military FPS games can cause players to become measurably more militarist in outlook. In a “realistic” military FPS game, the presence or absence of rules of engagement, for example, will dramatically change how the player approaches a mission. When the military itself consults on the design of such a game, this leads to a number of uncomfortable questions about why those choices were made."