Is there any rhyme or reason to Doom 3 ID Numbers?

[geo]

With PDAs, each member of the UAC staff has an ID number. Is there was any logic, rhyme or reason to the ID Numbers? The closest thing that I can think of is their position / XYZ coordinates on a map, but I do not think that is it. Here are examples and you should see what I mean:

| User Name: Frank Z. Cerano. Ph.D
| I.D. Number: 2001 -78
| Post: Delta Labs. Level 3
| Title: Doctor
| Security Clearance: General Access

| Name: Han M. Lee
| I.D. Number: 1 567-77
| Post: Delta Labs. Level 3
| Title: Administrative Assistant
| Security Clearance: General Access


| Name: Marten R. Shultz. Ph.D
| I.D. Number: 9431 -52
| Post: Delta Labs. Level 3
| Title: Doctor
| Security Clearance: Level 3 Control Station


| Name: Jack Gilbert
| I.D. Number: 561 9-89
| Post: Delta Main Portal
| Title: Security Specialist
| Security Clearance: General Access


| Name: Simon R. Garlick
| I.D. Number: 8623-68
| Post: Delta Labs. Sector 3
| Title: Research Specialist
| Security Clearance: General Access

[printz]

Are the spaces in IDs of the persons #2 and #4 intended?

At most simple, they could be in a fictional chronological order, except when the person chooses their favourite number. Greater numbers could mean newer workers.

Nice thing I forgot most of the people posted above, which means Doom 3 hasn't been fully explored.

[geo]

The spaces should be in there. I thought newer members higher numbers as well, but there being spaces I'm not sure.