USAF Captain <a href="https://en.wikipedia.org/wiki/Milburn_G._Apt" id="mwrQ" rel="mw:WikiLink" title="Milburn G. Apt">Milburn G. Apt</a> becomes the first person to exceed Mach 3. Shortly thereafter, the <a href="https://en.wikipedia.org/wiki/Bell_X-2" id="mwrg" rel="mw:WikiLink" title="Bell X-2">Bell X-2</a> goes out of control and Captain Apt is killed.