How much time does a person have to don and clear the gas mask?

The correct response is based on the established guideline for the quick and efficient application of a gas mask in a combat or hazardous environment. A trained individual should be able to don and clear the gas mask within 15 seconds. This time frame is crucial for ensuring that personnel can effectively protect themselves from chemical, biological, radiological, and nuclear (CBRN) threats while minimizing exposure.

Practicing within this time limit helps servicemembers develop muscle memory, allowing them to respond swiftly in real scenarios where rapid actions are necessary. The emphasis on a 15-second standard ensures that even under stress, Marines can maintain proficiency and readiness, which is vital for safety and operational effectiveness. The selected time reflects the balance between speed and thoroughness required in an emergency response situation.