A Service Tag is a tag meant to identify players quickly during a match. They consist of one letter and two numbers in Halo 3 and an arbitrary combination of 4 letters or numbers in Halo 3: ODST, Halo: Reach, and Halo 4. In team games, they appear above a player's head with a marker indicating their position, even through walls. When the player's reticle is pointed directly at the player, the full Gamertag is displayed instead.
It is beneficial for a player to set his service tag to be identical to his Gamertag so his teammates can more easily identify him.
List of Prohibited Service Tags[]
Some service tags are not allowed because they are vulgar, offensive, reserved, or copyrighted. These are not complete lists and are added to over time.
Halo 3[]
- Every service tag ending in 00
- A01 - Resembles AOL
- A20
- A23 - Reserved by UNSC
- A55
- C17
- E51
- E74 - Resembles the Red Ring error code E-74
- E43 - Resembles 343 in 343 Guilty Spark
- F03 - Resembles Fallout 3
- F43
- F46
- F48
- F49
- I17
- L17 - Reserved by UNSC
- N34
- N64 - Represents Nintendo 64
- N84
- P51 - Resembles "PS1"
- P52 - Resembles "PS2"
- P53 - Resembles "PS3"
- T17
- U50
- V50
- Z17
- 117 - Reserved by UNSC
Halo 3: ODST[]
- C0DY
- B4K4
- C0CK
Halo: Reach[]
- S117 - John-117's service number
- UNSC
- Sll - Resembles Spartan II
- 7 - Bungie's favorite number
- 0000
- Slll - Resembles Spartan III
- WIKI - Used by Halo Nation members
- RVB - Stands for Red vs Blue, a machinima series by Rooster Teeth
- 343I - Stands for 343 Industries
- AN - Stands for Allied Nations
- NOOB
- HALO
- JOHN
- YIFF
Halo 4[]
- 343I - Stands for 343 Industries
Trivia[]
- In Halo 3, when I17 is entered as a service tag, a message displays that says, "this service tag is currently reserved by the UNSC."
- A prohibited service tag can be used if it was randomly assigned to the player upon profile creation.