A playable demo for PRISM: Guard Shield is now available, offering a sample of this first-person shooter from Rebellion that's the free public edition of PRISM: Threat Level Red, a project they are developing for the U.S. National Guard. The demo has co-premiered on FilePlanet (registration required) and 3D Gamers, where word is: "This demo contains one mission where you play a security guard at the New York Harbor docks." The demo is mirrored on FileFront, Gamer's Hell, and Worthplaying.