Which of the following is NOT a type of ammunition for the Mk-19?

The assertion that "Ball" ammunition is not a type of ammunition for the Mk-19 is accurate because the Mk-19, which is a belt-fed, automatic grenade launcher, does not utilize ball ammunition as part of its operational design.

The types of ammunition specifically designed for the Mk-19 include Dummy rounds, which are used for training and ensuring safety during handling and operation; Training Practice (TP) rounds, which are designed to mimic the weight and handling characteristics of live rounds for training purposes; and High-Explosive (HE) rounds, which are the primary combat rounds used for engaging targets with explosive projectile capabilities.

Ball ammunition, which typically refers to standard lead or metal-filled projectiles used in most rifle and handgun applications, does not apply to the Mk-19. This system is built to fire grenades specifically designed for explosive impact, rather than conventional bullets. Understanding the types of ammunition utilized by this weapon is crucial for effective training and operational readiness within the Marine Corps.