Hey Rob,
I would say its possible but, as far as corps. level artillery is concerned. According to all of the evidence as to who all was assigned and attached to said divisions, it looks like the 997thFA Bn. was only attached at any time to the 69th Inf. Division. On the other hand though, I have only heard of them being used a few times. So, needless to say they weren't called up often so that has to be taken into account also.
However, running supplies could mean a lot of things, he could have been running supplies for the battery....etc...you never know. For him to be effective in a transportation company with deuce and a halfs he would have to be quaified to drive them. Just like during WWII you would have to be qualified just to drive a simple Jeep. So, I'd look through his papers and find out to see if he was. If not then I'd say its highly unlikely and with that I'd assume he'd havemeant he ran supplies for the battery only.
Listening to most of what you have stated I'd say he was probably assigned to the 997th FA Bn. for the duration of the war and after.
Hey Rob. ROCK OF THE MARNE!, M1903 Ready(locked and loaded), foxholes are the way to go!, C-rats...its whats for dinner!!
Sgt. J. Dunigan III
Able Co., U.S. 30th Infantry Regiment
U.S. 3rd Infantry Division(Reenacted)
PS...Do you know John Pagano of the 17th(Rev War)? He out of Richmond, Virginia?