Raven Shield incorporates some of the new features found in those earlier titles, such as the improved waypoint and command functions, and comes across as a more polished, upgraded version of Rogue Spear. The Sum of All Fears game plays very similarly to the Rainbow Six series with some influence from Ghost Recon (another game similar to Rainbow Six), but with an emphasis on expansive outdoor environments. Between the release of Rainbow Six: Rogue Spear and Raven Shield, Ubisoft and Red Storm produced a number of Tom Clancy titles: an add-on for Rogue Spear as well as a stand-alone Rogue Spear expansion, Ghost Recon, Splinter Cell, and a tie-in to the movie The Sum of All Fears.
