Gas attacks are commonly delivered by artillery shell. When a shell bursts, you can tell what it is intended to do. Whether to kill by a burst of shrapnel (fragmentary), frighten by a loud noise (concussion), set fire to troops, tents and vehicles (incendiary), or release a cloud of chemical, biological or radiological agents (CBR).
Wearing the gas mask at all times is like firing your rifle continuously (just in case the enemy might be out there somewhere).
When the attack comes, you may notice it, or someone sounds the alarm, and THEN you put on your gas mask.
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Doesn't anyone graduate Sunday School?
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