TEXT: E1 RECRUIT
  KLINGON RANK INSIGNIA
  ESS ENLISTED GRADES
  E2 JR
  CREWMAN
  E2 JR PRIVATE
  E3 VETERAN
  CREWMAN
  E3 VETERAN
  PRIVATE
  E4 SENIOR
  CREWMAN
  E4 SR PRIVATE
  E5 JUNIOR
  PETTY
  OFFICER
  E6 VETERAN
  PETTY
  OFFICER
  E7 SENIOR
  PETTY
  OFFICER
  E8 MASTER
     PETTY
     OFFICER
  S5 JUNIOR
  TECHNICIAN
  (OPERATIONS)
  S6 VETERAN
  TECHNICIAN
  (ENGINEER)
  S7 SENIOR
  TECHNICIAN
  (ENGINEER)
  S8 MASTER
  TECHNICIAN
  (OPS)
  Enlisted personnel of the Empire Security Service wear rank insignia with the underlying triangles in red, rather than the
  steel gray of Deep Space Fleet  or the brown of Army personnel. Those assigned to starships are addressed by naval
  ranks, while those assigned to Army units are addressed by Army ranks (S5 Junior Sergeant, S6 Veteran Sergeant, S7
  Senior Sergeant, S8 Master Sergeant).
  The Empire Security Service has technical enlisted personnel who wear a combination of the yellow triangle of a
  technician and the red triangle of the ESS. These technicians operate and maintain equipment, rather than lead security
  detachments.   Copyright © 2009 ADB, Inc.
  
SOURCE: textdata/thevault/Star Trek RPG/Prime Directive/02. Armadillo Design Bureau/PD20 Modern/Website Freebies/Klingon_Ranks_ESS_EMs.pdf