Firstly I will say discuss with your cf team to see if they think it's possible as they may know a different way in. I'm sure I've heard something about civilian services or something like that where you can do something within the navy but it's not the regular heavy duty stuff.
I have just read the application form for the royal navy it does specifically say that cystic fibrosis would make you unsuitable for service. The US navy may have different rules I'm unsure. It would be sad if you weren't able to join the navy because of cf though. I had a similar problem when I was in air cadets because they wouldn't let me go up in a plane to do aerobatics as the risk of asthma and CF causing lungs to pop, was too big. It was so disappointing and really upsetting when my friends were coming back with tales of their flying experiences.
I can't really offer anything more helpful though as I don't know anything about military services. If you have a cf social worker they might be able to get some information for you also.
I hope you can work something out, you sound like a very nice person wanting to help your country.
Moderator of the Cystic Fibrosis forum
Hey, I'm Gem with CF, age 29 and diagnosed at 2 years old. I'm no expert but having CF myself I've learnt a few things along the way.
Diagnosed with: Cystic Fibrosis, Asthma, ABPA, Clinical Depression, Mild Liver Cirrohsis, Mild Osteopenia, Erythema Nodosum, Proximal Myositis, Polyarthralgia