<a href="https://en.wikipedia.org/wiki/Project_Mercury" id="mwAQk" rel="mw:WikiLink" title="Project Mercury">Mercury program</a>: <a href="https://en.wikipedia.org/wiki/Mercury-Redstone_4" id="mwAQo" rel="mw:WikiLink" title="Mercury-Redstone 4">Mercury-Redstone 4</a> Mission: <a href="https://en.wikipedia.org/wiki/Gus_Grissom" id="mwAQs" rel="mw:WikiLink" title="Gus Grissom">Gus Grissom</a> piloting<i id="mwAQw"> <a href="https://en.wikipedia.org/wiki/Mercury-Redstone_4" id="mwAQ0" rel="mw:WikiLink" title="Mercury-Redstone 4">Liberty Bell 7</a></i> becomes the second American to go into space (in a suborbital mission).