I've got a couple gen-u-wine old Army OD blankets you can borrow if you're cold, Don.
I'd LOVE to have one of those blankets as made in Pitspitr's post OR Dr. Bob's, but I'm going to have to settle for FCS's (un)Civil War types. They certainly WERE used during the Indian Wars era (like other Government Issue equipment) until stocks were depleted.
Heck - you could have quite a collection if you only had the various blanket representations that were used back then. I saw at LEAST 4 different types of Modern blankets during
my Army days. And that doesn't count Navy, Air Force, Marine and Coast Guard types.