US Army 1st Infantry Division Structure, World War I
<a href="//commons.wikimedia.org/wiki/User:One_Salient_Oversight" title="User:One Salient Oversight">One Salient Oversight</a> <br>The original author is happy to change this graphic to reflect more accurate historical information, and encourages anyone to message him about it.
<span class="int-own-work" lang="en">Own work</span>