In the 1960's I was a kid living in the Granada Hills area while my dad worked at Rocketdyne in Canoga Park on the Atlas project, that was during the pre Rockwell years. I still remember going to what we called Rocketdyne park where they had a two story playground type rocket you could climb up in. In the late 1960's Dad went on to work for IBM in Boulder Colorado. I don't think the the park or playground rocket exist anymore, but if you were a kid in that area at that time you might remember it.
I think this might be the one...
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Now somewhere around Santa Susana I think.