<p><a href="https://en.wikipedia.org/wiki/Shoulder_Sleeve_Insignia_(US_Army)" class="extiw" title="w:Shoulder Sleeve Insignia (US Army)">Shoulder Sleeve Insignia</a> of the 31st Chemical Brigade.
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<dl><dt>Description</dt></dl><ul><li><i>Within a red circle 2 1/2 inches (6.35cm) in diameter and 3/16 of an inch (.48cm) in width on a white disc the red letters D D back to back in the form of an octagon, elements of letters 1/8 inch (.32cm) in width.</i></li></ul><dl><dt>Symbolism</dt></dl><ul><li>The two "D's" stand for the "Dixie Division" from which the brigade descended.</li></ul><dl><dt>Background</dt></dl><ul><li>The shoulder sleeve insignia was originally approved for the 31st Division on 7 March 1919. It was redesignated for the 31st Armored Brigade on 25 February 1974. The insignia was redesignated effective 30 September 2002, with description updated and a symbolism added, for the 31st Chemical Brigade.</li></ul>
<div style="display:inline-block;padding:0 3px;background-color:#CCF">Original:</div> <div style="display:inline-block;padding:3px 0;">U.S. Army</div> <div style="display:inline-block;padding:0 3px;background-color:#CCF">Vector: </div> <div style="display:inline-block;"><a href="//commons.wikimedia.org/wiki/User:Fvasconcellos" title="User:Fvasconcellos">Fvasconcellos</a></div>
Redesigned September 30, 2002.
Vector version of <a rel="nofollow" class="external autonumber" href="http://www.tioh.hqda.pentagon.mil/Graphics/31ChemBdeSSI.gif">[1]</a>, obtained from <a rel="nofollow" class="external text" href="http://www.tioh.hqda.pentagon.mil/Chem/31ChemicalBrigade.htm">the Army Institute of Heraldry</a>.