<a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mwAQQ" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>: US President <a href="https://en.wikipedia.org/wiki/Richard_Nixon" id="mwAQU" rel="mw:WikiLink" title="Richard Nixon">Richard Nixon</a> formally authorizes American combat troops to take part in the <a href="https://en.wikipedia.org/wiki/Cambodian_campaign" id="mwAQY" rel="mw:WikiLink" title="Cambodian campaign">Cambodian campaign</a>.