Congratulations on your find. I really should start working on my genealogy again but don't know when I'll find the time.
I filed a form NATF form 85 to get the pension record but if your looking for someone elses record I think you need to know what outfit they were in. I can't remember for sure as it's been awhile.
Don't you just love the history and mystery of this genealogy stuff and the nice people you meet.