Difficulty: Easy. Dead Air: Finale. Go through till you get to the first tank. Once the tank appears, call a vote to change difficulty to expert. Kill the bots or kick them via console. Rechange difficulty back to easy. Kill the tank. Done. Why change difficulty to expert? And btw, an exploit for you guys, when playing single player you can kick special infected (so when a tank is rushing at you just do 'kick tank' and it's gone), doesn't require you to enable cheats so you can use it to get Nothing Special