How did the antics of some bored guy in the land of holy cheese end up as a military contest?
He wasn't flying a lynx and definitely wasn't having a dogfight.
It's a common, garden variety French can, the manufacturer thereof is fairly particular about how it should be treated.
It is good to know the military professionals (some of them anyway) can spend as much time inverted/semi/quasi-inverted as they like, though that could really make drinking the hot cuppa a bit more challenging.
Back to beating the dead horse.