[b]It seems like the Trainee Start-Date is our setting.[/b]

Though, whether or not we have a cataclysmic event before, instigating the joining to the military, or if we have the first major breach happen during their training to catch them off guard even more is up for debate. Personally I like the latter, makes their relaxed military life go all out, yet I will have absolutely no issues with the former either.