What are the three rates of fire used for machine guns?

The classification of the three rates of fire for machine guns—sustained, rapid, and cyclic—reflects different operational needs and scenarios in combat situations.

Sustained fire refers to a firing rate that can be maintained over an extended period without overheating the weapon, typically at a lower rate, allowing for continuous engagement with minimal ammunition expenditure. It is essential for providing consistent suppressive fire while preserving weapon functionality.

Rapid fire allows the machine gunner to increase the rate of fire for short durations, enabling quicker engagement of targets. This rate is particularly useful during immediate threats or when rapid suppression is required. However, it requires careful management to prevent the weapon from overheating.

Cyclic fire reflects the maximum rate of fire that a machine gun can achieve under ideal conditions, often designed for brief bursts only, as sustaining this rate results in excessive heat buildup that can damage the weapon.

This classification system is pivotal for machine gunners to operate effectively and manage the weapon's reliability and longevity during various combat scenarios.