Nice photo. I do some collecting of little bits of obscure memorabilia from the 1916 Mexican Punitive Expedition.
Pic 1
Pic 2
I recently saw a WWII photo of a formation of Coast Guard personnel. The were in ranks on a pier and had a jeep mounted Colt machine gun. I'll see if I can run that one down. As I recall they had some other obsolete infantry arms as well. maybe some Krags.
I also do what I can to keep Huns out of the back 40.