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There were a lot of vector games, but I'd be astounded if anyone could confuse Battlezone with Star Wars. They're not even remotely similar.

Agreed - but time can be a strange mistress! The only vector game with predominantly green vectors I can think of would be Gravitar.

With a strip of red gel overlay for the radar at the top.

http://videogamehistory.wikia.com/wiki/Battlezone

There was another game similar to Battlezone only it was a cocktail table only version. Helicopter something or other, played it many times as a teen but I can't recall the name.