The North American X-15 was a rocket-powered research aircraft flown by NASA and the US Air Force from 1959 to 1968, reaching the edge of space and setting speed records that still stand, with Neil Armstrong among its twelve pilots. Documentary introductions like this one package that history into a few dramatic seconds of narration and music, and editors now reuse the format online to give aviation and aerospace videos a serious, cinematic opening. The clip works because the X-15 remains a symbol of peak experimental flight.