B) You Will Get Sick.
The reason behind this is more simple than it might seem: each division contains people from all over the country. When you get sick, your body identifies the intruder and creates antibodies to counteract it. You get better, but you still carry the bug inside you. So when you come across someone who's carrying a different strain than the one you're immune to, you're going to get sick again.
That's what happened with me and the Hispanic kids. He was getting bronchitis and I wasn't immune to his strain.
So when you're pulling people from all over the country, everyone is carrying something that someone else isn't immune to yet. The guy who talked at us today got pneumonia while he was in BT. You soldier through it—and you get the Bicillin shot, also referred to as "the peanut-butter shot" because you get stuck in your rear and it feels like peanut butter going into your bumcheek.
This section was surprisingly short. I felt it worth noting, though, considering how easy it is sometimes to get mad at being sick for seemingly no reason.