Hillberg wrote:
https://www.youtube.com/watch?v=S3vY2LyQn1A
They never worked
Early in my military career I was assigned an extra duty as the unit's NBC NCO. So off to NBC school I went. The most important phrase the instructor told us:
"No matter what a label says, No matter what the instructions say, No matter what some jackass tells you - IF YOU CAN SMELL SMOKE WHILE WEARING YOUR MASK, THEN ANYTHING CAN GET THRU THE MASK AND KILL YOU"
As far as i know, that has NEVER been proven false.
Words to live by
David