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Played around with Google Image Search for a while; couldn't get any hits at all on "Ford" together with "NAAO", "building" and "Rotunda".
"Ford", "building", "Rotunda" gave me a bunch of pics of the Rotunda building; and "Ford NAAO" offered me "Ford NAA", which gave me a ton of stuff on old Ford tractors.
What did NAAO stand for? Where did your Dad work (department)?