What distinguishes 20mm high explosive incendiary with tracer (HEIT) rounds from high explosive incendiary (HEI) rounds?

The distinguishing feature of 20mm high explosive incendiary with tracer (HEIT) rounds compared to high explosive incendiary (HEI) rounds is the presence of a ring of red "Ts" stenciled around the projectile. This marking is specifically implemented to indicate the ammunition type and its capabilities. The "T" signifies the tracer element, which allows for visual tracking of the projectile in flight, aiding shooters in adjusting their aim.

The tracer component enhances the round's visibility, making it useful for both aiming and assessing fire effectiveness during operations. This feature is crucial for gunners, especially in combat scenarios where tracking projectiles in flight can significantly influence the outcome of engagements.

Other options do not accurately describe differences between HEIT and HEI rounds. The explosive power of both rounds differs, but HEIT does not necessarily have greater explosive power; rather, it incorporates a tracer. Guided capabilities are not inherent to these types of ammunition as they lack precision-guidance technology. The size of the rounds is standardized as 20mm, so the diameter does not serve as a distinguishing factor.