Win 25 Survival Training Silver medals

There are 25 Survival Trainings in the game, they are marked as stars on the map. The best way to do these would be at night (when there are more zombies) and when you have max stats as it will help you kill faster. For general kills you would want to use a rollhawg, for vehicles/combo vehicles you would use a rollerhawg, for combo weapons use the Ultimate Grim Reaper, for fire weapons use the Ultimate Grim Reaper, for electric kills use the Electric Staff, for kills with firearms use both the ZAF and the Splitshot.