Corps personnel were classified in three distinct groups: uniformed personnel (carabineers); technical and auxiliary personnel; and civilian police investigators and identification personnel. Ranks of uniformed personnel generally corresponded to those of the army. There were four general classifications"jefes" (field officers), "oficiales" (company officers), "clases" (NCOs) "tropas" (privates)with a graded system of rank within each class. Uniformed personnel were promoted on the basis of annual examinations given when they attained the required time in grade, which was usually four years for all except captains and sergeants, who must spend five years in grade before becoming eligible for promotion. Classification of civilians was based on a nonmilitary two-category system composed of superiors ("funcionarios superiores") and subalterns ("funcionarios subalternos").