The Engineer kit appears in Battlefield 3. Equipped with high rate of fire Carbines, Engineers are deadly at close range environments such as the claustrophobic subway tunnels of Operation Metro. Responsible for the upkeep of friendly vehicles using their Welding Tool and the destruction of enemy armor, Engineers play a vital role on maps such as Operation Firestorm and Caspian Border where vehicle gameplay is extremely apparent. Players can equip direct fire projectile launchers against ground armor, choose lock-on launchers to target enemy aircraft, or simply lay down Anti-tank mines at strategic positions to potentially destroy enemy armor. Engineers can also provide indirect fire support in the form of a Mortar Strike or EOD Bot.