shoulder sleeve insignia of the <a href="https://en.wikipedia.org/wiki/20th_Engineer_Brigade" class="extiw" title="en:20th Engineer Brigade">20th Engineer Brigade</a>.
<a href="https://en.wikipedia.org/wiki/The_Institute_of_Heraldry" class="extiw" title="en:The Institute of Heraldry">The Institute of Heraldry</a>
2009
<a rel="nofollow" class="external free" href="http://www.tioh.hqda.pentagon.mil/Eng/20EngineerBrigade.htm">http://www.tioh.hqda.pentagon.mil/Eng/20EngineerBrigade.htm</a>