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My grandfather was wearing one and died. This is clear and thorough proof they don't work (he was hit with flak as a paratrooper).

That's why I'm working on an invisible parachute. So that flak gunners can't see the paratroopers.

Maybe I am missing something but an invisible parachute would reveal more of a paratrooper than a visible one.

Want to hide the paratrooper completely - use large, spherical parachutes. Elementary.

Aim for the center.