In the original Star Trek series, gold uniforms were command, red uniforms were engineering and security, and blue uniforms were science and medical. The above description of the original Trek series colors also applies to the recent Star Trek movies. As well as the uniform piping color on Enterprise-Cpthunt (talk) 23:15, February 15, 2014 (UTC) This Memory Alpha page on Starfleet uniforms has a good color-coded guide to what the uniform colors stand for.