I just got around to reading the latest (summer 2016) issue of Army History — they have a included a truly unique article on the graffiti created in various caves and quarries where the men of New England found themselves of the Western Front. Those men were in a lot of different places and saw a lot of action — the 26th was among the earliest AEF divisions to arrive in France.
The special contribution by the authors, Alisha Hamel and Paul X. Rutz, is that they tracked down the military records and photos of the artists who signed their works. For instance, we meet Thomas O'Halloran of Worcester, MA, and Company G of the 101st Infantry (see above), whose artwork, military record, and image are shown on a full-page spread. He had a tough war, evidently; his discharge card indicates he was severely wounded.
Read or download the and article and full issue here (and don't miss the cover):