Similar to the events of Chi Ceti, Platinum Team traveled to the Divine Eradication by Pelican with many of the UNSC Future Untold and several other UNSC vessels drawing the Covenant's attention. While the Spartans were in the Pelican, Annie-003 told Sam-015 to bring an M41 SSR MAV/AW, as she believed they would need all the firepower they could get. Several of the UNSC vessels then fired their MACs at the assault carrier, enough to create an opening in the Covenant carrier's narrow section for the Spartans to board. Platinum Team subsequently left their Pelican and used their thruster packs to propel themselves into the Divine Eradication.
The members of Platinum Team initially faced grunts and jackals and were able to take them out with little difficulty. When the Spartans began facing eliterangers, Annie-003 ordered Sam-015 to make liberal use of her rocket launcher against shielded enemies. Tougher infantry needed to be eliminated quickly as the Spartans could not afford the possibility of getting shot. Once the Spartans had fought their way deep enough into the Divine Eradication, they armed the nuke, putting it on a timer. However, they prepared for remote detonation should the timer malfunction. With the bomb in place, the Spartans proceeded to fight their way out of the Covenant ship. Commander Bella Caseiro contacted the Spartans, informing them that she was waiting for them outside aboard the UNSC Muted Whisper. Minutes after the Muted Whisper had safely recovered the Spartans, the HAVOK detonated, severing the Divine Eradication at its "neck" and also destroying nearby Covenant battlecruiser.
Platinum Team, searching for survivors on the surface of Liber (From left to right: Sam-015, Dom-094, Annie-003, Rick-077)
With the greatest naval threat gone, the Liber fleet proceeded to turn the tide of the naval battle. The Spartans were then deployed on the surface to help the UNSC ground forces finish off the Covenant infantry and also search for survivors. In orbit, the surviving UNSC ships were able to force the last two battlecruisers into retreat, ending the battle in favor of the humans. The synergy between the Spartans played a major role in their success at Liber, prompting the establishment of Platinum Team as a permanent Spartan unit under the leadership of Annie-003.
Platinum Team was sent to Miridem in order to help evacuate its civilians. There, Dom-094 discovered three chidren who were orphaned by and hiding from Covenant forces. Dom-094 took the children to the rest of the Platinum Team, and the SPARTANs escorted them to the nearest transport, successfully keeping the children from enemy fire.
The Platinum Team, along with SPARTAN-IIIRyan-A022, were called to defend the colony of Flora against the Covenant. Sam-015 arrived at the system before the other SPARTANs, and immediately began fighting on the surface. When the other four SPARTANs arrived, they were placed in pairs on two orbital defense platforms that were being boarded by Covenant infantry. Eventually, the SPARTANs left their respective stations, with Rick-077 piloting an OF92 Booster Frame, Dom-094 piloting a YSS-774 Spatha, and Ryan-A022 and Annie-003 flying a GA-TL1 Longsword. Rick-077 and Dom-094 landed on one side of the colonty to defend the colony on the ground, while Annie-003 and Ryan-A022 landed on the other side to do the same.
During the battle, ONI had intercepted a Covenant transmission regarding an artifact called the Contumacy. A map on the location of the artifact was hidden within an underground Forerunner structure on Flora. Rick-077, Dom-094, and Sam-015, who were closer to the structure were sent to retrieve the map and subsequently fought through special operations sangheili. Although the SPARTANs could not reach the map before the Covenant forces did, ONI managed to track the map to the Covenant battlecruiserUnwavering Conviction, which by chance, was hovering a few hundred meters over Covenant-occupied land to refit. The Pelican deployed Rick-077, Dom-094, and Sam-015, and a squad ODSTs just outside the Covenant territory. The SPARTANs boarded the battlecruiser by using its gravity lift, and immediately faced an attack on all sides. Through teamwork, they cleared the room and move on, although the majority of the ODSTs were killed in the ambush.
Meanwhile, ONI continued to track the Unwavering Conviction. AdmiralGerald de Gaulle of the UNSC Alexandra picked up Annie-003 and Ryan-A022 from the surface, and gathered a few other cruisers to prepare to surround the Unwavering Conviction. Once the Covenant battlecruiser completed its refit and left the atmosphere, the Alexandra fired one of its MACs at the vessel, depleting its shields. Multiple Longswords closed in on the Unwavering Conviction, battling her fighter complement. Ryan-A022 and Annie-003 once again piloted a Longsword of their own, this time having a squad of ODSTs in the fighter, and boarded the weakened battlecruiser by flying into its hangar bay. The SPARTANs of both sides were able to join forces aboard the ship and then kill the shipmaster and take the map. On their way off the Unwavering Conviction, however, the SPARTANs discovered that their Longsword was destroyed by Covenant. Fortunately, a Pelican was able to pick up the SPARTANs at the nearest hangar bay, allowing them to make their escape.