Once upon a time, I used to spend a lot of time in aircraft repair hangars of the U.S. Navy and the U.S. Air Force. I really loved being able to wander freely around the hangars. I was free to gawk as long and as much as I wanted. All the hangars had banners and posters about preventing FOD, as if it were some sort of drug addiction or venereal disease or other horrible immorality. It took me a while to find out that FOD means "foreign object damage" to aircraft technicians. A pair of pliers or a socket wrench, sucked into a jet engine, creates one heck of a mess. -Joe-
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