I came across an article in Wired.com about a U. Penn student who has developed a gaming vest that can gives users a sensation of receiving a gunshot, punch, kick, or slash in sync with various first person shooter games and/or other simulations.

I found it an interesting example of technology (computing/simulators) that was arguably born of the defense industry, then commercialized through video games, and now may be re-entering the defense or military space...

www.wired.com/gadgetlab/2010/03/gaming-v...ts-real-and-painful/

iroboticist.com/2010/03/26/tgv/#more-23
"TGV is a haptic feedback device designed to increase the immersiveness of first- and third-person shooter games. The vest includes a multitude of solenoids, eccentric-mass motors, and Peltier elements controlled by custom electronics and a personal computer. When the player’s character experiences injury in the game, the vest simulates the appropriate sensation (bullet hit, vibration, and/or heat) in the correct location on the player’s body. Beyond shooter games, we believe similar systems could be used to enhance laser tag, military training, movie watching, and other games."