<a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mwARw" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>: The <a href="https://en.wikipedia.org/wiki/United_States_Marine_Corps" id="mwAR0" rel="mw:WikiLink" title="United States Marine Corps">United States Marine Corps</a> sends a <a href="https://en.wikipedia.org/wiki/MIM-23_Hawk" id="mwAR4" rel="mw:WikiLink" title="MIM-23 Hawk">MIM-23 Hawk</a> missile battalion to <a href="https://en.wikipedia.org/wiki/South_Vietnam" id="mwAR8" rel="mw:WikiLink" title="South Vietnam">South Vietnam</a>, the first American troops in-country without an official advisory or training mission.