text: While all of the central groups had staffs ranging from 3 to 17 people permanently assigned to the group , comparing the size of These groups is of limited value because of wide variations in the ( 1 ) sizes of the organizations we studied , ( 2 ) inherent riskiness of their operations , and ( 3 ) the additional support the groups received from other organizational components and from numerous subordinate security managers and administrators .
  
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  Some groups had no staff .