Squire and Jenkins

Harnessing the Power of Games in Education (pdf) 

(the same text is also available in HTML format)

From early flight simulators to multiplayer games like America's Army (see Figure 1), the
military has long recognized the potential for games and simulations to enable the teaching and testing of skills that could not be rehearsed in real-world environments. Ironically, these military links have been exploited by fearmongers, such as military psychologist and anti-video-game activist David Grossman, to drive a wedge between games and schools.