This primary source comes from the Records of the American Expeditionary Forces (World War I).
Full Citation: Memo from Captain William E. Moore to Chief, G-2-D; 9/23/1918; Records of the American Expeditionary Forces (World War I), Record Group 120. [Online Version, https://www.docsteach.org/documents/document/memo-from-captain-william-e-moore-to-chief-g2d, April 27, 2024]