The <a href="https://en.wikipedia.org/wiki/National_Football_League" id="mw8Q" rel="mw:WikiLink" title="National Football League">National Football League</a> makes <a href="https://en.wikipedia.org/wiki/Football_helmet" id="mw8g" rel="mw:WikiLink" title="Football helmet">helmets</a> mandatory.<sup about="#mwt107" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-18"}}' id="cite_ref-18" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_7#cite_note-18" id="mw8w" style="counter-reset: mw-Ref 18;"><span class="mw-reflink-text" id="mw9A">[18]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-18"><cite about="#mwt104" class="citation web cs1" id="CITEREFPlexusGroupe2014">PlexusGroupe (2014-04-08). <a class="external text" href="https://profootballtalk.nbcsports.com/2014/04/07/recalling-when-the-nfl-made-helmets-mandatory/" id="mwCRI" rel="mw:ExtLink nofollow">"Recalling when the NFL made helmets mandatory"</a>. <i id="mwCRM">ProFootballTalk</i><span class="reference-accessdate" id="mwCRQ">. Retrieved <span class="nowrap" id="mwCRU">2022-01-10</span></span>.</cite><span about="#mwt104" class="Z3988" id="mwCRY" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=ProFootballTalk&amp;rft.atitle=Recalling+when+the+NFL+made+helmets+mandatory&amp;rft.date=2014-04-08&amp;rft.au=PlexusGroupe&amp;rft_id=https%3A%2F%2Fprofootballtalk.nbcsports.com%2F2014%2F04%2F07%2Frecalling-when-the-nfl-made-helmets-mandatory%2F&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+7"></span></span>