I think you guys should add a training mode that teleports you into a map of your choice and there are no players and you have total control over the game, so you can spawn CPUs to test your weapons on, and you should not be able to gain anything from it.
I have a theory that Lab of the Dead is a sequel to Road Of The Dead another game made by EvilDog, The mechanic could have just escaped the city and found them fighting off the zombies, wich he had to change his name so he dini't get shot and also he had to say that he was a scientist sent by the military to study the zombies.It would make perfect sence but one thing is that if this is true than why does he say Ah.Guess 'll have to go get another one." When you shoot a zombie in the head, shouldn't he like it?