I recently picked a nice WWI dogtag from a medical officer named Liva C. McLain, and found that he likely served as a surgeon with the 7th Evacuation Hospital at Chateau Montanglaust in France, a hospital especially equipped to deal with those wounded with mustard gas.
He is mentioned on page six of the following medical corps pamphlet,
It looks like Liva served with the hospital during some key battles during the war. His hospital served the wounded at both Chateau Thierry and Belleau Woods. Here’s a good JSTOR article about the unit’s participation at Belleau Woods:
Here is a link to a soldier in the 103rd Infantry Regiment of the 26th Division who spent some time recuperating at the 7th Hospital:
The 7th Evacuation Hospital was organized on 26 November 1917, at Fort Riley, Kansas, as Evacuation Hospital Number 7. The organization participated in WW 1 in the following campaigns: Champagne-Marne, Aisne-Marne, St Mihiel, and Meuse-Argonne. It received a decoration streamer with colors of the French Croix de Guerre with Silver Star, embroidered St Mihiel-Msuse-Argonne. The organization was demobilized on 1 May 1919.
Updates – 12/12/2013
In an effort to reevaluate some of my WWI collection material, I decided to do a new ancestry search on Lt. McLain. I came up with an interesting document to confirm the above information. Nothing earth shattering, but it provides a bit of clarity to the presented information.