In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.

Joe Henry Engle (born August 26, 1932), (Maj Gen, USAF, Ret.), is an American pilot who served in the United States Air Force, test pilot for the North American X-15 program, aeronautical engineer, and a former NASA astronaut. As of 2017, he is the last living pilot of the X-15 program. Question: NASA Astronaut Group 5 includes the last living pilot of which North American test flight program? Answer: X-15
, is an American pilot who served in the United States Air Force, test pilot for the North American X15 program, aeronautical engineer, and a former NASA astronaut.