Not to change the thread subject - but there are a few folks on here that do full backpacking trips with T1, which seems so far out of reach right now: I'm a brand new T1 living near Denver and am eager to better understand my D and get back outside as soon as possible - I can't imagine not being able to go for a bike ride or trail run. Like you said, I'll just have to carry a few more items.
Jastine - I can't imagine being told that I'm not allowed to do one of the things I've always wanted to because of my diabetes. However, as someone who is still getting a grip on my diagnosis, I find myself noticing more things that I "can't do," but I have found that if I take a second and think of all the things I can still do I realize that I am still blessed in the life that I have.
As others have said, there are millions of ways to serve your country or serve others - it just might take some digging to find what you're meant to do. These boards, for example, offer an opportunity to reach out to others who are having a tough time and give simple words of encouragement.
I'm sure you'll find a way, like many of the other EMS/firefighters out there, to help others and challenge yourself all at once!