In order to have more powerful fighting capacity, UNSC started the third phase of Sparta, but the initiator of the plan was not Dr. halsey, but another lieutenant colonel who was hostile to halsey. Sparta -3 is still trained by Sergeant Mendez, but this time he is not the main instructor. The main instructor is Sparta-14 1 matt in Sparta -2. The third phase of Sparta did not undergo strict genetic selection in the second phase, most of them were orphans in orphanages, and 600 people were divided into Beta Company and Alpha Company.

About Sparta III is the second half of the money of the ghost of the star.

In the first counterattack of Halo 3, Dr. halsey used the rebel night bat spacecraft to jump to a mysterious place-the shield world created by pioneers (Halo is a sword and shield) to avoid the attack of Halo, where she was besieged by the Star Alliance. In order to survive, she gathered Sparta (including Linda Kelly, Fred's gray team trio and other old S-2 and Tom's S-3) who were training around and hid in Aoxing. Inside-a Dyson sphere with a diameter of 1 10,000 kilometers is squeezed into several cubic meters, and then the plot can only be seen in the scorched earth of Halo 7 (it is said that halsey was rescued by UNSC but was sentenced to collaboration and imprisoned on Aoxing).