Someone with asthma that requires an inhaler can't join the military.
This actually kept me from being able to. I was pretty serious about joining when I was in high schoool and was told by recruiters I couldn't because of asthma which I had mostly outgrown by then. As an asthmatic-American I was disappointed. I played football and basketball but couldn't join the army or marines.
Bottom line - there are a lot of things that can keep you from being accepted. The debate over this reason has been politically engineered first one way and now the other.
Do any of you even know one single person this actually affects?