<a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mw3w" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>: <a href="https://en.wikipedia.org/wiki/The_Pentagon" id="mw4A" rel="mw:WikiLink" title="The Pentagon">The Pentagon</a> tells U.S. President <a href="https://en.wikipedia.org/wiki/Lyndon_B._Johnson" id="mw4Q" rel="mw:WikiLink" title="Lyndon B. Johnson">Lyndon B. Johnson</a> that if planned operations are to succeed, the number of American troops in <a href="https://en.wikipedia.org/wiki/Vietnam" id="mw4g" rel="mw:WikiLink" title="Vietnam">Vietnam</a> has to be increased from 120,000 to 400,000.