Halo: The Dawn of Night
Axi Delfex, a little boy saved by a Spartan created in the original mess they called the ORION Project, voluntarily becomes one alike and is now currently in an active Spartan group called Team Lintrue; a team of a Spartans under their own command, post-Covenant war in 2558.
He had a short-lived life that he only remembers only bits and pieces of before the incident. He went from being an original Spartan III, to being a Spartan IV, per qualification for joining the 7th.
His story isn't for those who are looking for some current ops BS, but for those wondering, how did he get there? Well, don't worry. It won't take long. Or, maybe it will. After all, Spartans do live full lives, just not the kind you're used to. This is Axi's story. Welcome; to the life of a Spartan! (Pre-story to Lintrue).