I think it’s cool that chief is being reunited with his old team. Now I haven’t read any of the books or comics but how are still alive? I thought all the original spartans died? Anyone have answers?
Halopedia or Halowikia should help you with that if you don’t have time to read the books.
In short, Chief and his team got separated before the events of Halo CE. You can see Linda’s vitals in Halo CEA, indicating that the Blue Team had been deployed from the Autumn. Afterward, Blue Team had their own problems (Onyx) to handle while Chief destroyed the Halo and finished the battle with the Covenant. As you can guess, Blue did what they could while Chief was in cryo and fighting the Didact. After that, they all reunite.