Can you hear a pin drop?

Earplugs are the most popular type of hearing protection. They come in many forms, but those made of yellow expandable foam that conforms to the ear canal are most familiar to us. To be effective, they must be installed properly, which means inserting them well into the ear canal to seal it entirely. (Photos by Tech. Sgt. Matthew Hannen)

PHOTO BY: Tech. Sgt. Matthew Hannen
VIRIN: 110107-F-0000T-001.JPG
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