normally  be  received  from  U.S.  security  authorities. They  may  also  be  received  through  the  security agencies  of  the  host  countries  concerned.  Infor- mation  may  also  come  from  local  police  forces or  be  received  directly  by  a  U.S.  command  or agency  as  a  threat  or  warning  from  a  terrorist organization. The  declaration  of  a  THREATCON,  in- cluding  the  security  measures  it  requires, may  be  decreed  by  a  U.S.  command  or  agency or   by   a   local   commanding   officer   or   head   of an  agency  following  receipt  of  intelligence through   official   sources   or   following   an anonymous  threat  message.  The  Alpha,  Bravo, Charlie, and Delta THREATCONs are described in  the  following  paragraphs: · THREATCON   ALPHA—This   condition is a general warning of possible terrorist activity, the  nature  and  extent  of  which  are  unpredictable. The circumstances do not justify the declaration of   a   THREATCON   BRAVO. · THREATCON   BRAVO—This   condition is  declared  when  an  increased  and  more  predictable threat of terrorist activity exists even though no particular   target   is   identified.   The   security measures  required  during  this  condition  may  have to be maintained for weeks without causing undue hardship,  without  affecting  operational  capability, and   without   aggravating   relations   with   local authorities. · THREATCON CHARLIE—This condition is  declared  when  an  incident  occurs  or  when intelligence is received indicating that some form of  terrorist  action  against  an  installation  or personnel  is  imminent.  The  security  measures required  during  this  condition  for  more  than  short periods  will  probably  create  hardship  and  will affect the peacetime activities of the installation and its personnel. · THREATCON  DELTA—A  terrorist  attack has  occurred  or  intelligence  has  been  received  that terrorist  action  against  a  specific  location  is  likely. Normally,  this  THREATCON  is  declared  as  a localized  warning. Each naval installation or command provides instructions  on  the  measures  its  personnel  should take  during  each  of  the  four  THREATCONs. THREAT  ASSESSMENTS Based on available information, your command must determine if the threat is going to be a short-, medium-,  or  long-term  threat.  Although  the  Naval Investigative Service (NIS) can supply those threat evaluations  on  request,  they  must  be  carefully analyzed  to  determine  the  required  THREATCON level. SAFEGUARDS   AGAINST TERRORISM Department  of  Defense  (DOD)  policy  is  to protect  to  the  best  of  its  ability  DOD  facilities, equipment, and personnel and their dependents from terrorist acts. Particular attention is given to  informing  and  protecting  high-risk  targets. High-risk  targets  include  the  following: Key  DOD  personnel U.S. Military Assistance Advisory Groups (MAAGs)  and  other  military  missions Technical  assistance  field  teams Training  and  advisory  teams Defense  attaché  offices Nuclear  weapons  sites Recruiting   offices Small  communications,  liaison,  and  admin- istrative  activities  considered  to  be  especially vulnerable to terrorist acts Absolute  protection  against  terrorist  activities is  impossible.  Therefore,  protective  plans  and procedures are based upon a balance between the degree   of   protection   desired,   mission   require- ments,    and  available  manpower  and  fiscal resources. The  most  cost-effective,  broadly  based  method of organizing an antiterrorism effort is to integrate it  as  much  as  possible  with  crisis  management procedures. Those procedures should set up ways to prevent, control, or contain natural and man- made  crises.  Essentially,  specific  antiterrorism 8-3