It's about as vague as him mentioning that he got the yellow shirt due to his Setlik III antics in "Paradise".
Timo Saloniemi
Which doesn't mean that red was the dedicated Ops color or gold the dedicated Command color. Just that these two professions fell into these two categories, alongside other professions, and for unestablished reasons.Sisko: "In the old days, operations officers wore red, command officers wore gold."
Timo Saloniemi