From Halopedia, the Halo wiki
The BYZANTINE JARGOON virus was embedded in the medical records of individuals augmented by the ORION Project. The virus was designed to exploit UEG identity confirmation routines and routine medical diagnostics in order to protect the identity of operatives involved in the project. The BYZANTINE JARGOON restrictions made it more difficult to detect any implants that operatives may have. The restrictions existed to guarantee ORION operators anonymity despite their augmentations.
List of appearances
- Halo: Official Spartan Field Manual (First appearance)
- Halo: Official Spartan Field Manual, page 80