Like I said, not important, just curious.
I still can't find exact dates but it appears the first military installations were build at Groom Lake during WWII abandoned after the war and the super secret stuff didn't begin until the early 1950s.
But yes, that is the beauty of super secret stuff. You can always posit further secrets as yet unrevealed. Though what exactly the government had so much of in 1936 that they'd need to store acres of it in about the most remote possible location I don't know.
Interestingly, I always interpreted the warehouse at the end of Raiders as not some super secret facility but rather a bureaucratic dumping ground. I found this result much more interesting. Not that the government knew what it had and was hiding it and protecting it but rather that it just got lost in the bureaucratic morass of the federal government. Filed away and then never thought of again.
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