Ko-zoku Gunjin (the Military from Imperial Family) (皇族軍人)

Ko-zoku Gunjin refer to the members of the imperial family who became general officers of the Imperial Japanese Army or Imperial Japanese Navy.

Summary
According to the Meiji Constitution (Constitution of the Empire of Japan), the Emperor was in the position to supervise the Imperial Japanese Army and Navy as Daigensui (Commander-in-chief). The Crown Prince was appointed as a general officer when he came of age or was regarded so.

[Original Japanese]