Army green. Mustard green belongs to the moderate saturation of the color, unlike the traditional green as saturated low and dark, but also not like the prairie green as saturated high, mustard green is just in the middle of the green and prairie green, and the military green is also in the middle of the green and prairie green, so mustard green is also known as military green green. Mustard green is a plant dye extracted from the mustard plant, and is also a relatively old dye.