MOPP Zero -Protective overgarment, overboots, and gloves
readily available and mask with hood carried.
MOPP 1 -Protective overgarment worn; overboots, gloves, and
mask with hood carried.
MOPP 2 -Protective overgarment and overboots worn; gloves and
mask with hood carried.
MOPP 3 -Protective overgarment, overboots, and mask with hood
worn; gloves carried.
MOPP 4 -Protective overgarment and mask with hood worn closed;
overboots and gloves worn.
b. Mask Only Posture.
In addition to the standardized MOPP levels, commanders have a Mask
Only option to protect from direct skin exposure to liquid or solid
contamination (transfer hazards). Tanks, some vans, and some
buildings are examples of this kind of partial shelter from
contamination. Inside these shelters, soldiers may be exposed to
vapor hazards but not to transfer hazards. The ultimate decision to
go to Mask Only rests with the commander. Mask Only is not an
appropriate command when blister agent hazards exist.
Commanders must balance the value of increased efficiency that Mask
Only posture gives against the increased risk it imposes. In case of
shelter penetration, ordinary clothing provides brief protection from
transfer hazards.
The following situations are appropriate for the Mask Only command:
Troops outside are at MOPP 3 or MOPP 4, and a chemical attack
has not occurred.
Troops outside are at MOPP 4, and the unit is in a downwind
vapor-hazard area only.
An attack has occurred, and the only hazard has been
determined to be nonpersistent vapor.
2-9
IS0345
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