Look at the time periods you guys, TF2 doesnt take place in present day, it takes place roughly when radigan was alive, even note the schematics for the guns on the walls.http://www.teamfortress.com/loosecanon/08.htmlAlso note the youthfullness of the administrator.
TF2 is actually just a secret war between RED and BLU, fighting over technology. The public is none-the-wiser.
Since this announcement creates a canon-shaped void in the lives of TF2's biggest story fans—our writers—we let them "imagineer" (their words) an epic Engineer story spanning three generations.