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 MIL-HDBK-1013/1A
from barrier to barrier to get to the secured resource. Delay time can also
include egress time required to load the secured resource and exit the
facility.
3.3.3
Barrier Forced Entry Penetration Time. Barrier penetration time is
defined as the time interval during which an intruder succeeds in creating a
man-passable opening through a barrier (i.e., a wall, roof, floor, door,
window, etc.) by forced entry. The penetration time is based on working time
rather than elapsed time. Working time only accounts for the interval that
an attack tool is actually used. This excludes the time required to change
tools, change operators, rest operators, and transfer tools, and enable
personnel to pass through the barrier. In not accounting for these
interruptions, the penetration time is inherently conservative. The
penetration times presented in Sections 4 and 5 apply to single barriers
only. In the case of multiple barriers, the total penetration time is the
sum of the individual penetration times provided by all barriers.
3.3.4
Ingress Time. Ingress time is the sum of all time intervals
required for an intruder to traverse from barrier to barrier within a site or
facility. This includes the time required to climb (up or down) through
horizontal barriers (e.g., roofs or floors) and the time to traverse between
vertical barriers (e.g., walls or fences). In general, ingress time
increases with increasing site or facility size, number of barriers
separating the secured area from the exterior, and size and types of tools
and equipment that must be transported between barriers. The facilities
engineer can increase ingress time by properly laying out the exterior and
interior of the facility.
3.3.5
Egress Time. Egress time is the interval required for an intruder
to load and carry stolen assets from a secure area when theft is the purpose
of the penetration. The egress time may be short or long depending upon the
interior layout of the facility; the availability of doors, windows, and
utility ports that can be opened; and the weight and volume of the assets
that are being stolen. In general, egress time increases with layout
complexity and any limitation on the number of doors, windows, and utility
openings available as exits.
3.3.6
Man-Passable Opening. A man-passable opening is defined as the
minimum area required for an intruder to physically pass through a barrier
and enter a secured area. DoD 5100.76-M defines man-passable as an opening
of 96 square inches (0.06 sq m), which is at least 6 inches (150 mm) wide or
high. In limiting the definition of a man-passable opening to 96 square
inches (0.06 sq m), the definition is inherently conservative, particularly
where the avenue of physical entry involves passage through a thick barrier,
such as an 18-inch (450-mm) reinforced concrete wall, or a long passageway,
such as a 20-foot (6-m) ventilation duct.
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