While yellow is generally the color of cavalry, here it stands for armor—the modern equivalent of the horse-mounted units of years gone by. In the middle of the shield is what is known as a caltrop, a triangular figure also found in the unit's Combat Service ID Badge (CSIB—link below). When the word caltrop is used in association with the military, it is an instrument with four iron points, disposed in a triangular form so that three of them are on the ground and the fourth
projects upward as a hazard, originally to the hooves of horses but in more recent times the pneumatic tires of wheeled vehicles.The caltrop displayed in III Corps' unit crest—a device technically known as a Distinctive Unit Insignia, or DUI for short—is depicted from an overhead perspective, with the white tip forming the point that harms hooves and/or tires. The blue and white of the caltrop are the colors associated with a Corps for identification purposes. Unlike many Distincitive Unit Insignias, the unit crest of III Corps does not feature the unit's nickname ("Phantom Corps") or motto.
Related Items: III Corps Unit Patch (SSI)III Corps Combat Service ID Badge (CSIB)