HALO jumps are used to enter hostile territory undetected when threats to both Airmen and aircraft are expected.
SR-71 Pilot Free Falls from Space
After test pilot Bill Weaver crashed, he thought he had died. It turns out he was falling from the edge of outer space, after his SR-71 Blackbird spy plane had disintegrated at 79,000 feet. From: PLANES THAT CHANGED THE WORLD: SR-71 Blackbird --- http://bit.ly/1gMS1D7