Rank Indicator Plaques are worn on the left breast of the uniform and are actually a combination of colored bars gently welded together. Rank Insignia may also include Code Cylinders; a security measure, allowing varying degrees of access from Computer Operations to Private Residences | HC-1 | Director | | | C-1 | Deputy Director | | | O-5 | Project Manager | | | O-4 | Assistant Project Manager | | | O-2 | Chief Engineer | | | O-1 | Senior Engineer | | | E-6 | Engineer | | | E-5 | Junior Engineer | | | E-4 | Senior Researcher | | | E-3 | Researcher | | | E-2 | Junior Researcher | | | E-1 | Researching Apprentice | | |