One person was very astute to point this out. Remember this scene in Episode 4 of the anime. This is the moment where the Top Ten of the 104th Training Regiment swear to give their beating hearts to humanity, throwing a salute to show their dedication. Note the sharpness/slackness of each person’s salute, namely the angle of their left arms. Now think…
Who has the strongest will to fight and serve in the line of duty?
Who here is in it for their own personal reasons?
…And who here has more dubious intentions in mind?