You hear the sirens going through the prison? It's your wake up call people. The zombies are here. Sentry, get your asses out front and center, anyone else that can use a weapon and kill a zombie? Have at it. Only head shots matter.
Raiders if you're out and can see this message or hear the siren, time to fall back and help protect the prison.
Medical, gonna need you on stand by. You know someone's getting hurt.
Everyone else, if you're not fighting because you're scared? Find a place to hide and stay out of everyone's way.