Rey eventually enrolled at ZAFT's military academy and met Lunamaria and Meyrin Hawke and Shinn Asuka, with whom he quickly became good friends. On the day Siegel Clyne and his followers were executed by Patrick Zala, Rey, Shinn, Lunamaria and Meyrin listened to Zala deliver speech against the oppression Naturals perpetrated towards Coordinators, leading them to eventually join ZAFT.
Second Alliance-PLANT War
Rey Za Burrel, Shinn Asuka and Lunamaria quickly rose to become some of ZAFT's top pilots, with Rey serving as Durandal's right-hand man. Rey helped guide Shinn to become more radical in the war against the Earth Alliance and kept him devoted to ZAFT's goals. He later assisted Gilbert Durandal in framing Athrun Zala as a traitor. When Athrun attempt to escape with Meyrin Hawke in a ZGMF-2000 GOUF Ignited, Rey and Shinn pursued the mobile suit. Rey pushed Shinn to destroy it and seemingly kill Athrun and Meyrin.
When Chairman Durandal unveiled "the Destiny Plan," in which everyone's place in society would be determined from birth by their genetics, Shinn began to second guess his support for ZAFT, Rey coaxed Shinn into believing that the "Destiny Plan" was what was best for humanity. He then revealed his origins to Shinn as a clone of an Atlantic Federation politician and the "brother" of Rau Le Creuset.
In the final battle, Rey faced Kira Yamato and attempted to kill him. As Kira fought off Rey, he told Rey that even though he was a clone his life was his own and convinces him to stop supporting Durandal's plan. After having his Mobile Suit damaged, Rey used it to fly to the space fortress Messiah. As Kira and Durandal were facing each other, Rey, having been moved away from the Destiny Plan by Kira's words, shot and fatally wounded Durandal. Despite the fortress falling apart due to the damage Kira inflicted on it, Rey chose to stay onboard and accompany the dying Durandal and Talia Gladys, whom he called "mother" right before dying in the explosion of the fortress.
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