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There are five THREATCONs:

(1) THREATCON NORMAL. Applies when there is no discernible terrorist activity. Under these conditions, only a routine security posture, designed to defeat the routine criminal threat, is warranted.
(2) THREATCON ALPHA. Applies when there is a general threat of activity against personnel and/or installations, the nature and extent of which is unpredictable, and circumstances do not justify full implementation of THREATCON BRAVO measures. However, it may be necessary to implement certain measures from higher THREATCONs resulting from intelligence received or as a deterrent. Commands must be capable of maintaining THREATCON ALPHA measures indefinitely, with only limited impact on normal operations.

(3) THREATCON BRAVO. Applies when an increased or more predictable threat exists. Commanders must be capable of maintaining the measures of this THREATCON for several weeks without causing undue hardship to personnel, substantially affecting operational capabilities, or aggravating relations with local authorities and members of the local civilian or host nation community.

(4) THREATCON CHARLIE. Applies when an incident occurs or intelligence indicates some form of threat action against personnel and/or facilities is imminent. Implementation of THREATCON CHARLIE measures for more than a short period probably will create hardships for personnel and affect the peacetime activities of units and personnel.

(5) THREATCON DELTA. Implementation applies in the immediate area where a threat attack has occurred or when intelligence indicates terrorist action against a specific location is likely. Implementation of THREATCON DELTA normally occurs for only limited periods of time over specific, localized areas. Commands cannot sustain THREATCON DELTA for extended periods without causing significant hardships for personnel and substantial reductions in capability to perform normal peacetime missions.

The military does not call them "THREATCON" levels anymore---now it is "Force Protection Condition" or "FORPROCON."

And if they are ordering DELTA...it is the same state of readiness that all military installations went to immediately after the events of Sep 11th.

Can't be too careful.