 Halo 3 introduces " support weapons " , which are cumbersome two @-@ handed weapons that slow the player , but offer greatly increased firepower in return . In addition to weapons , the game contains a new class of gear called equipment ; these items have various effects , ranging from defensive screens to shield regeneration and flares . Only one piece of equipment can be carried at a time . The game 's vehicular component has been expanded with new drivable and AI @-@ only vehicles . 
