31st Battalion US Guards in WWI
My wife's grandfather served with the 31st Battalion of the US Guards in WWI. We recently discovered a photo of his battalion in their training camp at Ft. Ethan Allen.
We are curious to find out about his unit or the US Guards in general. I am not familiar with military research and have mostly only found burial references for those who served in other battalions of the US Guards.
Does anyone out there know more about this unit, the US Guards in general or, at least, some resources to which I may refer with more information on this or its type?
Thanks so much in advance for any information.