HALO jumps are used to enter hostile territory undetected when threats to both Airmen and aircraft are expected.
Air Force Colonel Rides 600mph Rocket Sled
John Paul Stapp, M.D., Ph.D., Colonel, USAF (Ret.) (11 July 1910 – 13 November 1999) was a career U.S. Air Force officer, USAF flight surgeon and pioneer in studying the effects of acceleration and deceleration forces on humans. He was a colleague and contemporary of Chuck Yeager, and became known as "the fastest man on earth".