Probably the same reason as discussed here recently: A naked skydive inspired a way to keep pilots oriented in flight (military.com) https://news.ycombinator.co

Probably the same reason as discussed here recently: A naked skydive inspired a way to keep pilots oriented in flight (military.com) https://news.ycombinator.com/item?id=30959126 https://news.ycombinator.com/item?id=30959126 Edit: Probably that submission led to this one.