I would appreciate some help identifying a unit or command reference.

I'm working on researching local WWI soldiers and there is one, Charles Stanislaus Krayna, who in a letter home signs his name, followed by "85th R.A.G., 73rd Battery, American Section, Santhony-Ain, France."

73rd Battery points to some sort of artillery unit, but I cannot make sense of the "85th R.A.G." Has anyone come across this unit or command before?

Unfortunately, his VA Master Index card is of no use as it lists Charles as a Private in "Casual Detachment 232, 165th Depot Brigade," which I suspect was his unit upon discharge.

Any insight is greatly appreciated!

In Pursuit of the Past,
Museologist44