Battlefield 3's multiplayer matches see players take on one of four roles: Assault, Support, Engineer and Recon. The Assault class focuses on assault rifles and healing teammates. The Support class focuses on LMGs and supplying ammunition. The Engineer class focuses on supporting and destroying vehicles. The Recon class focuses on sniping and spotting enemies. The mechanics of the weapons have been changed to utilize the new engine: compatible weapons may have bipods attached which can then be deployed when in the prone position or near suitable scenery, and provide a significant boost to accuracy and recoil reduction. Suppressive fire from weapons blurs the vision and reduces the accuracy of those under fire, as well as health regeneration. The Recon class can put a radio beacon anywhere on the map and all squad members will be able to spawn on the location of the beacon. Several game modes are present, including Conquest, Rush, Squad Deathmatch, Squad Rush and for the first time since Battlefield 1942, Team Deathmatch. However, more game modes are available through the purchase of extra downloadable content packs. The PC version of Battlefield 3 is by default launched via a web browser from the Battlelog web site. A server browser is present in console versions of the game, however.