PRISM Guard Shield is now available, offering Rebellion Software's promised free military shooter featuring the U.S. National Guard. The game's initial release includes two single-player missions and three multiplayer maps, with the download debuting on 3D Gamers and FilePlanet (registration required), and mirrors on 3D Downloads, FileFront, Gamer's Hell, Internode Games Network, Strategy Informer, and Worthplaying.