The PC demo for Darkest of Days syncs with our timeline tomorrow, August 11. The demo will take players to Custer's Last Stand at Little Bighorn and the American Civil War's Battle of Antietam. Folks can try out some futuristic weaponry on those poor 19th century soldiers. Just make sure not to hit the glowing blue guys -- the future needs them.
The game is currently in development by Iowa-based 8monkey Labs and will be released on September 8. If you're interested in more of the weaponry from DoD, be sure to check out the previously released weapons trailer.
em:
http://www.joystiq.com/2009/08/10/darkest-of-days-demo-arrives-on-time-tomorrow/