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There is no G.R. Seymour listed in the officers roster from Volume II of the divisional history by O'Ryan. There are two Seymours listed, but no majors and none with those initials. The roster is very complete, it lists all those who at some time served with the 27th but were later assigned to other units both overseas and in the States. I also looked in the narrative section of Volume I for any reference to him in the divisional artillery and there is none (neither volume is indexed). I was hoping there might be some mention of him since with that rank he would have been a battalion commander. This makes me think that perhaps he may have served with another unit during the war and was assigned to the 27th very late and went home with the division in February 1919. Regarding the other comments about the 52nd FA Brigade's (104th, 105th, 106th FA Regiments) detached service, after the German spring offensive, the decision was made to give priority to shipping the divisional infantry regiments and MG units to France. Nearly all of the divisions which reached France after March 1918 in effect "lost" their artillery which arrived later along with the orgainc ammunition trains. As these artillery brigades trained and were employed, they supported those divisions which were in the line during the Meuse-Argonne offensive. Even the artillery brigades of the earlier divisions, once committed, stayed in the line to support other divisions. The seperated artilley brigades were reunited with the rest of their divisions after the armistice and went home with them. In sum, it had everything to do with operational necessity and nothing to do with logistics.

Yes, each field artillery regiment was organized into two battalions of three lettered batteries each. Like the infantry regiments, each artillery regiment also had a headquarters company and a supply company.

I'm presuming you meant an infantry regiment. A WW I division also had three field artillery regiments and an engineer regiment. Each infantry regiment had three infantry battalions of four companies each, plus a Headquarters Company and a Supply Company. The companies were lettered: A through D were the 1st Battalion, E through H the 2nd, I through M the 3rd (there was no J Company). The organization was the same for all of the AEF divisions regardless of origin (Regular Army, National Guard, National Army). The regiment was nominally commanded (at least, as required by the Table of Organization and Equipement) by a colonel with a lieutenant colonel as second-in-command, the battalions by majors, the companies by captains. I hope this was what you were looking for.