ETL 1110-3-456
16 Aug 94
f. Time of Day of Attack. The times of day that attacks are
expected should be obtained when possible. The time of day will
influence which features of a facility are most conspicuous and
will help prioritize the various CCD measures. For example,
visible shadows would not be the primary concern if only night
attacks are expected, but facility surfaces that stay warmer than
the surroundings and are detectable by thermal infrared sensors
might be a primary concern at night.
g. Reconnaissance and Surveillance. Reconnaissance is the
act of obtaining information about the target area prior to or
after an attack and is usually accomplished by aerial photography
or satellite imagery. Surveillance implies monitoring the target
area for long periods and recording pertinent information such as
construction layout, ingress and egress activities, communication
traffic, and facility function. Surveillance is typically
accomplished by aerial photography, satellite imagery, and
intelligence gathering.
A-6
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