Which of the following is NOT one of the basic colors found on a map?

The correct choice is yellow, as it is not one of the basic colors typically used on military maps. The basic colors found on a map generally include black, green, brown, blue, and sometimes red. Each of these colors has a specific purpose: black is often used for buildings and roads, green indicates vegetation, brown represents elevation and terrain features, and blue is used for water features.

Yellow can be used in some maps, usually to represent certain features or areas, but it doesn’t hold the same foundational significance as the other listed colors in standard map reading. This is why yellow is considered the answer that does not belong among the basic map colors.