g/wiki/Private_(rank)" title="Private (rank)">private</a> soldier before World War I.<sup id="cite_ref-1914-1918.invisionzone_3-2" class="reference"><a href="#cite_note-1914-1918.invisionzone-3"><span>[</span>3<span>]</span></a></sup></p>
<h2><span class="mw-headline" id="World_War_I">World War I</span></h2>
<p>Simpson joined the <a href="//en.wikipedia.org/wiki/Royal_Naval_Air_Service" title="Royal Naval Air Service">Royal Naval Air Service</a> on 8 August 1915.<sup id="cite_ref-Abovethe_2-1" class="refere