It’s interesting to me that caption to the 1956 newspaper picture in the first linked article identifies someone from the NSA. I thought the mere existence of that agency was basically classified information well into the ‘70s.
That’s puzzling! Thanks to the author’s sourcing, a quick search turned up a scan of the full article [0]. My initial thought was, maybe it’s a name collision and this National Security Agency in 1956 is an insurance or accounting firm, but the source article doesn’t elaborate.