Quarantine Coloring Book
The U.S. Army M40 series was developed to replace the M17A2 for the Army and Marines. The M40A1 shown here is equipped with lens outserts and C2 filter. This example was made by ILC Dover in 1992.
Similar masks in my collection: U.S. Army M40A2, U.S. Army M42A1, U.S. Air Force MCU-2/P