The 1st Air Defense Brigade (, Hanja: 第ä¸Âé²空æ åÂÂ) is a military formation of the Republic of Korea Army. It is subordinated to the (ìÂÂëÂÂë°©ìÂÂì¬령ë¶Â). It headquartered in Gwacheon, Gyeonggi Province, and is responsible for defending the P-73A and P-73B areas of Seoul, the South Korean capital city.
On 1 December 1986, the unit were established as 3rd Air Defense Brigade. The 3rd Air Defense Brigade was reorganized into the 1st Air Defense Brigade after being left with the Army when the Air Defense Command transferred to the Republic of Korea Air Force on 1 July 1991. After that, the brigade was under the command of the Third ROK Army, and on 1 December 2011, it was merged with the 10th Air Defense Group and transferred to the Capital Defense Command.