Full resolution (3,000 × 1,955 pixels, file size: 637 KB, MIME type: image/jpeg)
|COPYRIGHT NOTICE: PUBLIC DOMAIN|
This file is a work of a US military or federal government employee, taken or made during the course of an employee's official duties. As a work of the US Federal Government, the file is in the public domain. (Title 17, Chapter 1, Section 105 of the US Code)
Source: Gas Mask on Wikipedia
Appears on these pages
A gas mask is a mask put on over the face to protect the wearer from inhaling airborne...