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Specifically, it needs reorganization, expansion on 57th expedition, and further inclusion of current team.
The original squad was considered the most elite squadron, having a total kill record exceeding 200, and were capable of killing almost any Titan in their path. Due to their strong bond, they were able to synchronize with each other to coordinate their attacks without direct or verbal communication. During the 57th Expedition, their mission was to protect Eren Yeager from Titans, and their secret objective became to lure the Female Titan into a trap. The mission failed, and all the original members of the Special Operations Squad, except for Eren and Levi, were killed.
After the events of the supposed breach of Wall Rose and the massacre during Eren's rescue, Levi forms this squad anew with its members being the remaining soldiers of the 104th Training Corps' Top 10 and Armin Arlert in order to watch over Eren and Historia Reiss.
The original Special Operations Squad was hand-picked by Levi himself. They watched over Eren Yeager during his Titan transformation experiments in the days leading up to the 57th Expedition. On the expedition itself their mission was to protect him and they did not engage in the rest of the operation. After they see the signal flare to return, they mistakenly believe the mission was successful and plan to leave. During their departure, they think they see Levi returning to them, but it turns out to be an unexpected assailant. Gunther Schultz is killed by a disguised Annie Leonhart who then transforms and kills Petra Ral, Oluo Bozado, and Eld Jinn.
After Eren was rescued from Reiner Braun and Bertolt Hoover, the Armored and Colossus Titans, Levi took it upon himself to form a new Special Operations Squad. The new team consists of the remaining members of the 104th Training Corps' top ten graduates and Armin Arlert. They serve to protect Eren and Historia Reiss after the latter reveals her true identity. The current members have dwindled from seven to six after Historia Reiss became queen.