Yokusōzei

The Yokusōzei (翼総勢, Yokusouzei; literally meaning "Winged Army") is the military organization that serves the Jade Kingdom. It is arranged into an army that possesses at least one thousand enlisted troops. Their name is derived from the insignia worn upon the backs of their uniforms, a pair of white and black wings, which represent the goal of the kingdom to one day reclaim the stolen land of in the name of their King; essentially freeing themselves from being forced onto the spiritual world's outskirts.

Behind the Scenes
Bearing essentially similar ideals, the Yokusōzei were inspired by the Survey Corps from the anime and manga, Attack on Titan.