What type of M2 ammunition can be classified as Ball/Tracer?

The classification of M2 ammunition as Ball/Tracer refers specifically to the type of ammunition used that combines a standard projectile with a tracer element. The APIT, or Armor-Piercing Incendiary Tracer, serves this purpose because it has an armor-piercing capability along with incendiary properties and tracer features to provide visual targeting during firing.

This type of round is especially useful in combat situations where it allows the shooter to see the projectile's trajectory, aiding in aim adjustments for subsequent shots. The tracer element burns brightly, making it easier to track the projectile's path, which is particularly valuable in low-light conditions or for engaging moving targets. The APIT rounds therefore effectively combine multiple functionalities, fulfilling the requirement for Ball/Tracer classification.

In contrast, the other types of ammunition listed—Full Metal Jacket, Incendiary, and Armor-Piercing—serve different purposes without the tracer component. Each of these ammunition types has specific roles defined by their construction and intended use in combat scenarios, but they do not combine the functionalities of ball and tracer in the same way that APIT does.