MeteoricAssault is basing his pay-grade insignia on 
CT:Book 6 administrator ranks.  In Book 6, only IISS Field Scouts do not use ranks or a formal hierarchy, but the IISS "Bureaucracy" has a formal administrative rank structure, which is where the "IS-#" designations come from (IS-10 and higher are "
Administrator Ranks", the equivalent of "Commissioned Officers").  
 |  |  |  | 
 |  |  |  | 
| Adv CharGen Rank Equivalent | IISS Rank (Pay Grade) | Description | Basic CharGen Rank | 
| E1  | IS-1  | Recruit  | -- | 
| E2  | IS-2  | Apprentice, Clerk  | -- | 
| E3  | IS-3  | Journeyman  | -- | 
| E4  | IS-4  | Skilled Worker  | -- | 
| E5  | IS-5  | Asst Team Leader  | -- | 
| E6  | IS-6  | Team Leader  | -- | 
| E7  | IS-7  | Asst Supervisor  | -- | 
| E8  | IS-8  | Supervisor  | -- | 
| E9  | IS-9  | Senior Supervisor  | -- | 
| 01  | IS-10  | Admin Trainee  | 1 | 
| 02  | IS-11  | Jr Administrator  | 1 | 
| 03  | IS-12  | Administrator  | 2 | 
| 04  | IS-13  | Gp Administrator  | 3 | 
| 05  | IS-14  | Sr Administrator  | 4 | 
| 06  | IS-15  | Scout Commander  | 5 | 
| 07  | IS-16  | Scout Leader  | 5 | 
| 08  | IS-17  | Senior Scout Ldr  | 6 | 
| 09  | IS-18  | Sector Scout Ldr  | 6 | 
[TC="4"]
TABLE OF RANKS Traveller
[/TC]
[TC="4"][/TC]
[TC="4"][/TC]
 
In general, I have always thought the administrator rank titles work fine for the truly "bureaucratic" branches of the IISS Bureaucracy, but there are two branches under the Operations Office (
Scout Fleet and 
Security) where I thought different rank-names for the IS-pay-grades would be more appropriate.  For 
Security Branch, something akin to USAF Ranks (up thru Colonel at IS-15 [O6]) would work 
*, and the actual ship-crews of 
Scout Fleet might have something similar to Merchant Ranks (which is similar to what MeteoricAssault has done).
* - I believe this was actually suggested in GT:First-In or GT:JTAS.