In Halo 3:
Service Tag: I79 (due to not being allowed to use "179")
Armor Primary Color: Green
Armor Secondary Color: Blue
Armor Detail: Blue
Emblem: Yellow Spartan with red swords
Helmet: Mark V
Shoulders: Mark VI (Mark V looks the same)
Chest: E.O.D. (because it looks like Mark V)

In Spartan Logs:
Service Tag: 179
Armor Primary Color: Same as Halo 3
Armor Secondary Color: Same as Halo 3
Armor Detail: Same as Halo 3
Armor type: MJOLNIR Mark V (Post-Black ARM War: MJOLNIR Mark VI)

Variants of either version of MJOLNIR change according to the current situation. (e.g. He will wear E.O.D. in bomb-handling deployments, E.V.A. in tank-driving deployments, etc.)