Oh, and even if yours is one of the years where "S" is a Blue color, if the year before or after yours was Green, then it's entirely possible that's what the color was.
We've seen way too many times where a Bronco's color was an adjacent year, and through Ford's idiotic use of the same letter to denote completely different colors, or the same color with a different name, or code, these things were hard to find rhyme or reason to.
Paul