When was the last living pilot of the X-15 program inducted into the National Aviation Hall of Fame ?
Albert Lee Ueltschi:  On July 21, 2001, he was enshrined at Dayton, Ohio, in the National Aviation Hall of Fame class of 2001, along with test pilot Joe Engle, United States Air Force flying ace Marion Carl, and USAF ace Robin Olds. Joe Engle:  As of 2017, he is the last living pilot of the X-15 program.
July 21, 2001