A rather professional chiclet keyboard (at SAC HQ)

Maybe mildly interesting in the context of frequent discussions about keyboards of early home and consumer computers: I stumbled upon this footage of a command terminal at SAC HQ (US Strategic Air Command) from what must be early 1970s. I guess, this must have gone through a few human factor analyses. Notably, this is from when intended users didn’t necessarily have any training as a typist. It may show where all these chiclet keyboards came from…

Still from this SAC video: https://youtu.be/_JkZ4ffPK7c?feature=shared&t=621

(In the vicinity of this short scene, we can also see a color panel, which may be split in 4 separate views. The views seem to composites, as may be judged from a few character misalignments.)