This image depicts <a href="https://en.wikipedia.org/wiki/Duncan_Pitcher" class="extiw" title="en:Duncan Pitcher">en:Duncan Pitcher</a> during <a href="//commons.wikimedia.org/wiki/World_War_I" title="World War I">World War I</a>.  It is a crop of File:Duncan le Geyt Pitcher.jpg which was taken from <a rel="nofollow" class="external free" href="http://www.raf.mod.uk/history_old/cfscommen1.html">http://www.raf.mod.uk/history_old/cfscommen1.html</a> which bore the copyright notice: Crown Copyright 2003 and © Deltaweb International Ltd 2003.  Deltaweb International Ltd's web site (<a rel="nofollow" class="external free" href="http://www.deltaweb.co.uk/">http://www.deltaweb.co.uk/</a>) states that they first formed in 1993, some 75 years or more after this photograph was taken, and so the extent of their copyright claim cannot cover this photograph; it presumably relates to the design of the page in which this photograph sat.  Therefore this photograph is now in the public domain.
Unknown author<span style="display: none;">Unknown author</span>
between 1914 and 1918 <div style="display: none;">date QS:P,+1914-00-00T00:00:00Z/8,P1319,+1914-00-00T00:00:00Z/9,P1326,+1918-00-00T00:00:00Z/9</div>
RAF website (<a rel="nofollow" class="external free" href="http://www.raf.mod.uk/history_old/cfscommen1.html">http://www.raf.mod.uk/history_old/cfscommen1.html</a>)