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Specifically, it needs Eve of the Counterattack arc and expansion of 57th Exterior Scouting Mission arc.
The special operations squad consisted of some of the most elite soldiers in the Scout Regiment, 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 Jaeger from Titans, and their secret objective was to lure the Female Titan into a trap. The mission failed, and all 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 Cadet Corps Top 10 and Armin Arlelt in order to watch over Eren and Historia Reiss.
The Special Operations Squad is hand-picked by Levi himself. They watched over Eren during his Titan transformation experiments in the days leading up to the 57th Exterior Scouting Mission. On the expedition itself their mission was to protect him and they did not engage in the rest of the operation. After they saw the signal flare to return, they mistakenly believed the mission was successful and planned to leave. During their departure, they thought they saw Levi returning to them, but it turned out to be an unexpected assailant. Gunther Schultz was killed by a disguised Annie Leonhart who then transformed and killed Petra Rall, Oruo Bozad, and Eld Gin.
Some time after the Wall Rose invasion, Captain Levi selects a number of Scout Regiment recruits to safeguard Eren Jaeger and Historia Reiss in an isolated forest cabin. The recruits bring supplies to the hideout while Eren attempts to clean before Levi's arrival. When Levi arrives, his is dissatisfied with their cleaning.