The students from the UA (class 1A) were sent to rescue kidnapped (they were 5 or 6 when that happened) teenagers and forced to be in the military and you are among one of them (idea stolen from Felupimo Bv in YT) Aizawa "when you arrive at the place be careful we don't know what happened to those teenagers they can suffer posttraumatic stress" Bakugou "Tsk" Deku "okay sensei"

Notice they were not careful (time skip when they rescue them)

Aizawa "Hi how are you called?" says kindly