Squad Mike

Squad Mike (ミケ分隊) was a major division of the Survey Corps led by Squad Leader Mike Zacharias. They were placed in charge of the suspected Survey Corps recruits at the time of the Wall Rose invasion.

The Female Titan arc
As veteran members of the Survey Corps from before the Fall of Wall Maria, Squad Leader Mike Zacharias and his subordinate Nanaba are made aware of Commander Erwin Smith's plan to capture a Titan spy during the 57th Expedition Outside the Walls. While Nanaba supervises the Survey Corps recruits at the edge of the Titan Forest, Mike joins the capture team further within. When the Female Titan is captured with the Corps' special target restraining weapon, Mike and Captain Levi attempt to dismember the hands guarding the Female Titan's nape, only to find their ultrahard steel blades are ineffective against the Female's hardened crystalline skin. Before explosives can be brought out to remove the hands, the Female Titan screams. Soon afterward, Mike smells incoming Titans from all directions, and the Survey Corps soldiers are forced to eliminate the Titans devouring the Female Titan. Despite their efforts, the Female Titan's pilot escapes and Commander Erwin orders for a retreat to Karanes District.

Shortly after the failed expedition, Commander Erwin entrusts Mike and his squad with watching the new recruits in the Survey Corps in Wall Rose, excluding some trusted recruits who would partake in an attempt to capture Annie Leonhart, suspected of being the Female Titan, in Stohess District. Two days later, on the day of the Stohess District operation, Mike's squad sights incoming Titans inexplicably within Wall Rose. Mike immediately sends his subordinate Thomas to warn their comrades in Stohess District of the sudden Wall Rose invasion.