Where is the identifying information of a 20 mm round marked?

The identifying information of a 20 mm round is typically marked on the projectile itself. This marking includes crucial information such as the lot number, type of projectile, and sometimes the manufacturer’s information. These markings are essential for identifying the round and ensuring it is used correctly and safely during operations. The projectile is the component that directly engages with the target, making it vital for accurate traceability and accountability.

While other components like the cartridge case may have some markings, they often do not contain the comprehensive identifying data found on the projectile. Packaging may also include information, but it is primarily intended for transport and storage rather than individual round identification. The fuze is a separate component that may also have markings, but it is not the primary source of identification for the round itself. Hence, the projectile is the correct answer due to the specificity and importance of the markings it carries.