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Lieutenant TJ Murphy is a member of Icebreaker squad in the UNSC Marine Corps who is stationed aboard the UNSC Infinity. During the Requiem Campaign, Murphy helped Fireteam Crimson in many of their missions on Requiem.
During the Requiem Campaign, Murphy, along with the rest of Icebreaker squad, was listed as MIA. They had been captured by Covenant forces and were imprisoned in the same detention facility as Fireteam Crimson. While Crimson was escaping, Roland picked up Icebreaker's signal and Crimson freed them. Murphy helped Crimson by remotely taking over a nearby Phantom and later piloting it for them through various missions in Covenant territory.
Sometime later, a Covenant/Promethean force attacked the UNSC Infinity, causing Captain Lasky to recall all Spartan forces. Crimson and Murphy encountered heavy Covenant/Promethean resistance. Murphy eventually delivered Mantises to support Crimson, allowing them to secure a landing zone. On their way back to Infinity, the ship's automated defense system auto-targeted their Phantom. Despite Murphy's evasive maneuvers, the Phantom took a direct hit, lost control, and subsequently crashed into one of Infinity's hangars. Murphy survived the crash but was stuck inside the downed Phantom. Miller ordered Roland to send an extraction team for Murphy, but couldn't get through to the AI. Eventually, Murphy was rescued or managed to escape on his own.
After the attack on Infinity was thwarted, Murphy continued to assist Fireteam Crimson in their activities on Requiem, providing them with Pelican support. When Fireteam Majestic reported they were under fire from Covenant artillery, Murphy flew Crimson to the site of the artillery. While dropping off Crimson, Murphy informed Infinity that Fireteam Kodiak's Pelican was shot down, Miller then warned Murphy to evac as Crimson would radio for a ride later. Murphy later assisted Crimson and Lancer in destroying a Covenant nest in the Warrens. During the same mission, he provided evac for Crimson and Fireteam Switchback, who'd been rescued from the Covenant base.
At the end of the Requiem campaign, Murphy retrieved Fireteam Crimson after they deactivated one of the slipspace artifacts binding the Infinity to Requiem. Murphy successfully brought Crimson back to the Infinity just in time for everyone to escape Requiem's destruction.
In March 2558, the UNSC Infinity picked up distress signal originating in the Artesia-702 system. When Infinity arrived in the system on March 11, it found a damaged freighter, the Pilgrims' Pride. Murphy, leading several other Pelicans, analyzed the freighter. He reported that the freighter was in bad shape and was leaking atmosphere.
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