It has to be fake. Training veteran skydivers to fight in the air is incredibly stupid but its no where near as stupid as training fighters to learn to skydive so they can fight in the air. If you can't control yourself there is so much that can go wrong.
If you don't have proper control of yourself in the air it is incredibly dangerous. There has been case of two sky divers hitting eachother at terminal velocity and their legs basically exploding and impacting.
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If you are not in control of your self in the air you can go into a death roll where you start spinning uncontrollably. It causes you to pass out and even when your parachute automatically deploys it gets tangled up in your body.
"If a man with no arms and a man with no legs started learning karate, the same light bulb would appear over every head in Japan. That’s right: Glue them together and see if it can kill a panda."