The 21st division is subordinated to the III Corps and is headquartered in Yanggu County, Gangwon Province.

It is a frontline division that protects the GOP and GP along Gangwon Province's border with North Korea.

[2] The division was established as the 2nd Education Brigade in Yangyang, Gangwon-do on 15 January 1953, near the end of the Korean War.

The majority of the division's operational area is a rough mountainous terrain, and it is responsible for maintaining the barbed wire barrier along Gangwon Province's border with North Korea.

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