rlcarey's right, it's not an NRA question, it's a question for the OCC because it revolves around how they want their form completed. My guess: They're assuming that you ID'ed your NRA's with a passport and they want the country of issuance. Alternatively, the country listed on their W8-BEN if you have one. Of course, they could have just asked you that...
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.