What part of the gas mask helps with airflow while it is being worn?

The outlet valve is the component of the gas mask that facilitates airflow while it is being worn. This valve is specifically designed to allow exhaled air to escape from the mask, which helps prevent the buildup of carbon dioxide and makes breathing easier for the wearer. When the Marine exhales, the outlet valve opens, allowing air to flow out without letting contaminants in, promoting comfort and breathability during use. Maintaining good airflow is crucial in combat situations where efficient respiration can affect operational effectiveness.

The other options do play roles in the overall function of a gas mask but do not directly assist with airflow. The inlet port is responsible for allowing external air to enter the mask, whereas the ventilation screen may help filter certain particles but does not manage the airflow dynamics effectively. The sealing ring is essential for ensuring a tight fit of the mask against the face, preventing leaks, but it does not contribute to airflow.