Chemical warfare

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And here is the Mission Oriented Protective Posture (MOPP) as used by the US military.

MOPP Level Zero: The protective mask, chemical protective helmet cover, skin decon kit and detector papers are carried in the mask carrier. The overgarment, overboots, and gloves are stowed nearby.

MOPP Level One: The overgarment is worn. M-9 detector paper is attached to the overgarment.

MOPP Level Two: The overboots are worn.

MOPP Level Three: The protective mask and chemical protective helmet cover are worn.

MOPP Level Four: The rubber gloves and cotton liners are worn.

MOPP Level Five: Not an offical level, but was often seen added to the training flyer next to the NBC room. MOPP Level Five is the famous Bend Over and Kiss Your Arse Goodbye Level.