Persons who have been given access to an installation can be counted on to be of no threat is a false statement.
When a terrorist assault has taken place or there are signs of impending terrorist activity against a particular locality, FPCON Delta is typically used as a localised warning. The installation goes into high alert and puts in place the necessary security measures. Commanders are urged to add to the required security measures.
A terrorist assault is always feasible when there is a generalised global threat of potential terrorist activity. However, this merely justifies a normal security posture. The best information currently available shows no sign of a likely attack.
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