Huntsman Academy

"As the four kingdoms of Remnant are looking for a new generation of Huntsmen, everybody at the age of 17 are required to be in a Huntsman Academy and train to fight against the Grimm in order to keep humanity and Faunuses in this world going, but there may be some exceptions via invitation. I can't believe I'm too old to be on a Huntsman Academy, because I'm just a young adult who serves for the Republic of Korea Army, but at least there is still enough time for me to be a Huntsman in here I guess."

--Su Ji-Hoon, The Rise of Team RWBY