No problem. Since the question was asked about how an asthma diagnosis could hurt someone, that came immediately to mind.
It turns out that asthma is one of those conditions that can be outgrown, because of airway expansion, and possible changes to allergy responses. At the time I enlisted, if you hadn't had an attack since age 13, you were golden. This was during peacetime, when they could be a little selective. The rules have a funny way of changing when they're coming up short on recruiting targets... at least for enlistees.