What is the nomenclature for illuminating rounds used in the M777A2?

The nomenclature for illuminating rounds used in the M777A2 is M485. This round is specifically designed to create a burst of illumination over a designated area, providing essential visibility for targeting and determining enemy positions during night operations. The M485 is equipped with a pyrotechnic payload that produces a bright light when ignited, assisting troops in navigating and engaging in combat effectively after dark.

In contrast, the other nomenclatures mentioned do not refer to illuminating rounds compatible with the M777A2. The M402 is a different type of round used for training purposes, while the M109 refers to a different artillery system entirely, and the M320 is not associated with illuminating munitions. Understanding the role and specific designations of artillery rounds, such as the M485, is critical for effective field operations and mission success.