It will be in progress til the day I die (or at least that's the way it feels.) I've been going through cemetery book compilations and comparing men of the right age against the US Pension records on Ancestry.com. I find about 2 to 10 vets a week (when I get the chance to go to the library). I also record CSA vets when I find them. Eventually, I will do the same with Oklahoma CSA pension records. So a long, drawn out process.
Mahlon