Soldiers may be told to use mask-only posture when they are:
a. Far enough from the enemy where immediate threat is not imminent.
b. Not exposed to direct sunlight.
In a protected environment, such as inside a tank or shelter.
d. Not in darkness where they cannot see droplets.
When you suspect the presence of a chemical or biological agent, you should first:
a. Give the alarm by verbally yelling "Gas!"
b. Put on your mask.
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