Brigadier-General <a href="https://en.wikipedia.org/wiki/Lionel_Charlton" class="extiw" title="w:Lionel Charlton">L E O Charlton</a> CB CMG DSO RAF just after his appointment as Air Attache at Washington.
Unknown author<span style="display: none;">Unknown author</span> — Not given in Flight magazine, found by Google image searching or in uploader's extensive library of early military aviation books.
Published 27 February 1919
Flight magazine (<a rel="nofollow" class="external free" href="http://www.flightglobal.com/pdfarchive/view/1919/1919%20-%200261.html">http://www.flightglobal.com/pdfarchive/view/1919/1919%20-%200261.html</a>)