Valve Developed In USA Alien Swarm Video Game Trailer

[Archival Reupload / Free Civic Advertising / Journalistic Repost; Uploader does not own the Copyright to this Media.]
Original Video; https://www.youtube.com/watch?v=603izhzohos
Published July 16 2010
"Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes." -Valve