Add Yahoo as a preferred source to see more of our stories on Google. Marines and sailors will now have to take annual Chemical, Biological Radiological, and Nuclear (CBRN) mask fit and seal training.

A Marine tests the fit of his M50 Joint Service General Purpose Mask outside the gas chamber at Camp Hansen, Okinawa. (Lance Cpl. Andrew R. Bray/Marine Corps) The Marine Corps and Navy will require ...

In an interesting twist, more civilians are buying something once limited to war zones. Tactical gas masks may not be on the shopping list for every Florida consumer, but the U.S. market for gas masks ...