Conduct Unmasking Procedures
031-503-3002
Conditions: Given a group of soldiers in MOPP 4 (with M8 detector paper) in an area where
chemical agents have been used; and one of the following situations:
1. An M256A1 Chemical Agent Detector Kit is available.
2. An M256A1 is not available.
Standards: Conduct unmasking procedures without incurring casualties.
Training and Evaluation
Performance Steps:
1. Senior person present selects one or two soldiers to unmask after permission is received from
higher headquarters.
2. Conduct unmasking procedures with use of an M256A1 detector kit.
a. Conduct unmasking procedures in the shade.
b. Use M256A1 detector kit to test for chemical agents. Use M8 detector paper to check for
possible liquid contamination. Continue unmasking procedures only if both tests come up
negative.
c. Direct the selected soldiers to unmask for five minutes; and then don, seal, and clear their
masks.
d. Observe these soldiers for ten minutes for symptoms.
e. If no symptoms appear, direct all soldiers to unmask.
f. Check soldiers for delayed symptoms. Have first aid treatment available.
g. Complete steps 2a through 2f in sequence.
3. Conduct unmasking procedures without use of an M256A1 detector kit.
a. Conduct unmasking procedures in the shade.
b. Use M8 detector paper to check for possible liquid contamination. Continue unmasking
procedures only if test comes up negative.
c. Direct the selected soldiers to take a deep breath and break the seals of their masks
(keeping their eyes open) for 15 seconds, and then seal and clear their masks.
d. Observe these soldiers for ten minutes for symptoms.
e. If no symptoms appear, direct these soldiers to break the seals of their masks, take two or
three breaths, and then seal and clear their masks.
f. Observe these soldiers for ten minutes for symptoms.
g. If no symptoms appear, direct the selected soldiers to unmask for five minutes; and then
don, seal, and clear their masks.
h. Observe these soldiers for ten minutes for symptoms.
i. If no symptoms appear, direct all soldiers to unmask.
j. Check soldiers for delayed symptoms. Have first aid treatment available.
k. Complete steps 3a through 3j in sequence.
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