Question: Are there more than three Star Fleet uniform colors? In the episode where Dr. Crusher is pulled into an alternate dimension aboard the Enterprise, there is an older science officer (not a recurring character) who is wearing a green uniform. When he is next to Dr. Crusher in her blue uniform, the difference is quite noticeable. Red is command, blue is sciences and medical, and gold is engineering, security, and ship services. What would green be for? I've only seen it in this one episode.
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Chosen answer: The colors of the uniforms (like the models of the uniforms) change a lot. In the time frame of the original series for example the command color was gold/yellow and red was engineering. In TNG these colors are switched and altered. Also, the blue color for science has been more greenish in other periods of (Star Trek) time. And finally, uniform alterations are, to some extend, accepted (Troy often wears more casual clothing on duty and Worf adds cultural decorations to his uniform. To conclude: the green uniform might be a character's choice or an older type of uniform.
Cetan