Spent some time Friday helping place flags on veteran's graves at a local cemetery for Memorial Day. Hope we found all of them. We used to get angry calls from widows that we forgot their husband's grave or family members that we did not put a flag next to grandpa. But then we typically found that those graves we missed did not have a VA headstone or plaque or were not engraved with mention of their service. We try to keep up with those unmarked ones.
Many graves were from WW1, one was of a private who had served with the 20th Engineers. That was a regiment that at the time had over 500 officers and 30,000 men, bigger than any reinforced division that I ever heard of (although most of that 30K never made it to France prior to the Armistice). Primarily made up of lumberjacks and sawmill workers in 49 Engineer Companies (Forestry), it also included 12 road and bridge companies, 36 engineer service companies, plus railroad and quartermaster units. Many of the officers in the Forestry Companies were recruited from the US Forestry Service.
After Pershing's advance HQ, they were the first American unit in France. Many came from here in the the great NW states of Washington and Oregon, but it was the only unit in WW1 that included men from every state in the union. Their casualties were not that large for such a big unit: 95 died when the USS Tuscania was torpedoed by a U-Boat, and at least two that we know of were KIA in the Argonne Forest. But it provided huge benefits for the war effort, not just for the AEF but also for Brit, French, and Canadian allies. Some served in direct support of US infantry divisions. The forestry units harvested French timber for the war effort: bridge timbers, buttress sets for saps, bomb proofing, bunkers, shoring for trenches, railroad ties, 50 and 100 foot tall pilings for piers and bridges, logs for corduroy roads, poles/stakes for barbed wire support poles, duckboards, and millions of cords of fuelwood - all the sinews of war - or at the time that timber was itself considered a munition.