As evidenced by the Victory Ribbon he received after the Armistice, Frank was present at the battles of Aisne-Marne, St. Mihiel and Meuse-Argonne. He also spent some time in the Defensive Sector. Reportedly, he was a messenger.
His unit was awarded the French Croix de Guerre with gilt star for the Aisne-Marne campaign.
From the early 20th century coinage found in Frank's private box after he died, he was apparently in Belgium, Holland, France and Germany during his time in Europe. There was also a matchbox cover with a picture of the Cathedral in Cologne, Germany and the words Kolner Dom under the picture.
Here are some photos from his album. Unfortunately, he did not indicate the names of his fellow soldiers, except for one labeled as "Allie W." I hope that someone reading this posting might have information about the men who served with Frank.