The <a href="https://en.wikipedia.org/wiki/United_States_Air_Force" id="mwAQ4" rel="mw:WikiLink" title="United States Air Force">US</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Republic_of_Vietnam_Air_Force" id="mwAQ8" rel="mw:WikiLink" title="Republic of Vietnam Air Force">Republic of Vietnam Air Force</a> begin <a href="https://en.wikipedia.org/wiki/Operation_Rolling_Thunder" id="mwARA" rel="mw:WikiLink" title="Operation Rolling Thunder">Operation Rolling Thunder</a>, a sustained bombing campaign against <a href="https://en.wikipedia.org/wiki/North_Vietnam" id="mwARE" rel="mw:WikiLink" title="North Vietnam">North Vietnam</a>.<sup about="#mwt103" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-19"}}' id="cite_ref-19" rel="dc:references" typeof="mw:Extension/ref"><a href="./March_2#cite_note-19" id="mwARI" style="counter-reset: mw-Ref 19;"><span class="mw-reflink-text" id="mwARM">[19]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-19"><cite about="#mwt100" class="citation news cs1" id="CITEREFSheehan1971">Sheehan, Neil (1971-06-15). <a class="external text" href="https://www.nytimes.com/1971/06/15/archives/vietnam-archive-study-tells-how-johnson-secretly-opened-way-to.html" id="mwB4I" rel="mw:ExtLink nofollow">"Vietnam Archive: Study Tells How Johnson Secretly Opened Way to Ground Combat"</a>. <i id="mwB4M">The New York Times</i>. <a class="mw-redirect" href="./ISSN_(identifier)" id="mwB4Q" rel="mw:WikiLink" title="ISSN (identifier)">ISSN</a><span id="mwB4U" typeof="mw:Entity"> </span><a class="external text" href="https://www.worldcat.org/issn/0362-4331" id="mwB4Y" rel="mw:ExtLink nofollow">0362-4331</a><span class="reference-accessdate" id="mwB4c">. Retrieved <span class="nowrap" id="mwB4g">2023-03-01</span></span>.</cite><span about="#mwt100" class="Z3988" id="mwB4k" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=The+New+York+Times&amp;rft.atitle=Vietnam+Archive%3A+Study+Tells+How+Johnson+Secretly+Opened+Way+to+Ground+Combat&amp;rft.date=1971-06-15&amp;rft.issn=0362-4331&amp;rft.aulast=Sheehan&amp;rft.aufirst=Neil&amp;rft_id=https%3A%2F%2Fwww.nytimes.com%2F1971%2F06%2F15%2Farchives%2Fvietnam-archive-study-tells-how-johnson-secretly-opened-way-to.html&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMarch+2"></span></span>