Gunner soon developed an extraordinary ability to detect the sound of approaching Japanese aircraft up to 20 minutes before they were visible or picked up by radar, while completely ignoring friendly Allied planes. Recognizing the reliability of his alerts, leadership authorized Westcott to sound a portable air raid siren based on Gunner's behavior, providing crucial early warnings that saved lives. Gunner became a vital part of the community and a massive morale booster, accompanying the men everywhere and even joining pilots during practice flights.