Nike Ajax
... that the US Army's Nike Ajax was the world's first operational surface-to-air missile?
... that the US Army's <b id="mwEBU"><a class="mw-redirect" href="./MIM-4_Nike_Ajax" id="mwEBY" rel="mw:WikiLink" title="MIM-4 Nike Ajax">Nike Ajax</a></b> was the world's first operational <a href="./Surface-to-air_missile" id="mwEBc" rel="mw:WikiLink" title="Surface-to-air missile">surface-to-air missile</a>?