In this screenshot (and many others like it) from the UNSC Weaponry reveal, we get a very clear look at the possible service tag design in Halo 4. The service tag has 8 characters and is in the format of S058 343I. So two sets of four. The first set is the Spartan number, and the second set is the name.
Does this mean that we will be able to create service tags like S117 JOHN in Halo 4? Or is this just a gamertag? This addition to the service tag may be a feature of Spartan Ops, which is designed to include you in the Halo Universe. You are your Spartan Ops character. It would make perfect sense for Spartan Ops to give you a Spartan number, followed by your first name.
So do you think this is the new service tag design? Or just a gamertag? Or just a design used by 343 internally for these reveal videos?
Edit: False thread. In that same screenshot, there are two tags in the bottom right corner (Q880 in 1st, H218 in 2nd) that are probably the service tags. I’ve been looking at too many screenshots.