In reply to FactorXXX:
> I seem to remember something like:
> Some exercises to prove that the respirator hopefully worked and with no leaks.
> Remove respirator and state Rank, Name and Number (hoping the instructor doesn't pretend not to hear you).
> Stumble out of the chamber in lots of discomfort.
Yelling 'Gas, Gas, Gas' after masking supposedly purged any chemical agent from the mask.
Quite what a faceful of CS whilst reciting Number, Rank and name actually proved still eludes me.
Judging by the burning razor nicks on my neck under the hood, NBC suits didn't stop particulates, let alone nerve agents.
All in all I prefer the reciting of poems about rainbows with air sampling inside the mask approach!