NASA marches to it's own drum. I've done a lot of work for them, primarily at the local Federal Airfield.
Their logos are in the public domain, but they do enforce their usage guidelines.
I'm not a fan of the worm, but I respect it. CNN will be thrilled.
So as far as models, the timeframe is 1974- 1992. Space Shuttle started in that time period, prior to that I guess there were Sky Lab missions.