This man was a United States Army infantry soldier during the Mexican Expedition in the World War I era. I do not know what his name was. I call him Bob.

This image was created (with substantial alterations) from a photograph taken by C. Tucker Beckett, another infantryman, at night while they and their fellows of Company A, 16th Infantry Regiment were seated around a bonfire. The Regiment was encamped at San Jerónimo, Chihuahua, Mexico, and the photo was taken May 27th, 1916. Beckett wrote an interesting narrative article in a contemporary photography magazine that is available via Google Books at the time of this writing: Beckett, C. Tucker (1916-11). "Military Photography in Mexico". The Camera: A Practical Magazine for Photographers 20 (11): pp. 599-616.