In the book "SOS Service of Supply" by Isaac Marcosson, (immediately available for free at google books) The author devotes several pages to the the Graves Registration group, and details how the men were rushed into the trench's (and no-man's land) immediately after the shelling to gather body parts before they had a opportunity to get scattered.The gathering of body parts was done by Black Labor Battalions of the Quarter Master Corps. This was not glamourous work, and when the war ended on 11/11/18, the gathering of body parts continued. The 307th returned May 28, 1919. They missed all the parades and celebrations. There were 23,000 buried at the Argonne National Cemetery by Black "pioneers"of the 813th, 815th, and 816th Infantry regiments. I'm looking for what the 307th Service Battalion was working on.