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          * fatigued. dehydrated. or undernourished soldiers

          * soldiers who work shifts of indefinite length

          * female soldiers (tend to experience heat stress difficulties in MOPP
IV earlier than males)

          * tired leaders. command and control personnel

    b.   What jobs are most affected?

          * monotonous, repetitive. or boring tasks

          * tasks which require attention to detail, concentration, and short-term
memory (e.g., calculations, radio authentication, map plotting, coding messages,
repeating communications)

          * tasks which are not self-paced (e.g., any task that must be done
quickly or according to a fixed schedule)

          * tasks which require arm-hand steadiness (e.g., aiming/shooting a
weapon)

          * tasks where confusion, misinformation. and disorientation are
common

          * tasks with sudden or sustained demands for physical exertion

    c.   How is performance affected?

          * reaction times and decision times are longer

           * even routine tasks are done more slowly

            * errors of omission are more common (e.g.. leaving out a critical word
in a message; failing to detect important signals)

          * mechanical mistakes are more common (e.g., reading from the wrong
column on a code sheet or transposing digits in a coordinate)

    d.   When is performance affected?

          * rested, well-trained soldiers will show little performance decrement in
the first 4 hours of an 8-hour shift


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