A slight correction....I believe it opened in 1976.
From their website...
"The Museum opened in 1976 with 75 aircraft as part of the nation's bicentennial celebration by the..."
I visited it a couple of weeks after it opened and IIRC, it consisted of a small trailer where the ticket seller sat and some airframes freshly dragged over from AMARC.
Great fun....they had a disassembled B-50...I took a piece of fabric from its shredded rudder. I still have it.
Also, I saw that wingless F-94 was in the brush.
I crossed the rope line to look at it...
Probably not a good idea with rattlensnakes...
I have color slides...somewhere.