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The first film is an overflight of Launch Complex 26 and Launch Complex 5-6 in 1965. This was shortly after the complexes were deactivated. One site or the other would be designated as the U.S. Air Force Space Museum; NASA eventually chose LC 5-6 for their site as it was where Alan Shepard and Gus Grissom launched on the first two Mercury flights. The Air Force converted the LC 26 blockhouse into a museum.
The second film appears to show a walk-through of the new museum shortly after it opened to the public in 1968. You can see Kennedy Space Center Visitor Information Center tour buses driving past the complex.
The third film depicts KSC VIC tourists walking about the grounds, then loading about the tour buses.
The final film is the dedication of the museum's exhibit hall in 1970. It was originally a garage for the fuel trucks.