is Harry Crosby, a poet who felt his way through the darkness of the Great War to a diary posthumously published under the title of
Shadows of the Sun.
Source: “Am’n Ambulance Field service in Woevre Forest, Bell to warn of gas waves.” George Grantham Bain Collection, Library of Congress, http://www.loc.gov/pictures/item/ggb2005023124/. Photoshopped. Click to enlarge.