Long, long ago, my mom taught me a trick: If I have to almost-sneeze, I just look at a bright light. I'll invariably sneeze twice. I always thought this was normal, but it turns out it's from a genetic nerve malfunction. It's called Photic Sneeze Reflex, and it's reasonably common.
Unfortunately, people with this condition may not fly combat aircraft. Presumably, I'll still be able to pilot armored subterranean combat-drilling-machines. (Motto: Drillers Do It Boring!)