That is a very interesting family memo. I think I'll pass it along to my cousin. Have you ever written a letter about it (and included maybe a copy of the photo as documentation) to any Army historical outfits? That's a fact, or detail maybe, worth preserving.
You say the photo was actually taken during the visit to the U.S.?
my grandfather commanded an ACR battalion
ACR = ?
Yes, the photo was taken at a National Guard training facility somewhere in Western Tennessee.
ACR stands for Armored Cavalry Regiment. He commanded the 2nd Battalion of the 14th Armored Cavalry Regiment.