What military rank is Zachary Smith? I know he's the leader of the Trainee corps, but you have to have had some prior experience to train others. Usually the minimum rank is command sergeant major (In the U.S.). But in the world of a lot, they also get those with field experience, or have amazing skills and qualities. He would be the Chief supervisor, no doubt, but his previous military rank is important as well. I would like to propose an ironic situation! Zachary Smith is a warrant officer from the military police! (warrant officer is technically the 14th rank in the military) and he has no real experience with titans!!!! :D I just thought that it would be fun to put that out.