http://cisr.nps.navy.mil/cyberciege/index.htm
CyberCIEGE enhances information assurance education and training through the use of computer gaming techniques such as those employed in SimCity™ and RollerCoaster Tycoon®. In the CyberCIEGE virtual world, users spend virtual money to operate and defend their networks, and can watch the consequences of their choices, while under attack.A limited distribution version of CyberCIEGE is now available at no cost to agencies of the US Government.