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I joined NFCU this morning and after I told them my Grandfather was in the Army in WWII that was all they asked for. The rep asked if I had any dates and seemed satisfied when I told her I had a copy of his enlistment form and his serial number. We'll see if they ask for anything more when the "Welcome" packet gets here.
Thanks for all the info here guys. I just called but was asked for my grandpa's DD214. Lesson learnt (again and again): YMMV