On the item that you pointed to suggesting George Teater was an officer in the Illinois Regiment
>18899-12-65-66-November 6, 1781: Top document. Major Thomas Quirk >certified George Teater supplied 428 rations for himself and other officers >belonging to the Illinois regiment.
There are a couple of points that might be made:
A.Yes, that certainly implies that George was serving as an officer of some description, since it reads in paraphrase "George Teater...for himself and other officers".The role here, however, seems to be providing quartermastering services.Not sure what that really means in terms of his overall role in the Illinois Regiment.Was he traveling with the regiment, and periodically finding supplies, or was he based somewhere else (like at home) and periodically bringing the unit supplies.It would be interesting to know more about this, but its not something I'd personally pursue.
B.Is it possible that this George Teaters son George Jr.?