The spartan 5 program started during the end spartan 4 program with the rise of the insurrection in mind and the need of Spartans that can go undercover and still hit hard but milijor armor under suit was the main issue so they mass produced a new under suit that could be taken off easily and put easily and was compatible with older armor types such as the armor used by the spartan 2s,3s and 4s
The UNSC recruited children of UNSC personal,orphans, and UNSC recruits that requested the job