In 1991, 36 Scud-C transporter erector launchers (TELs) were deployed at Shingye-kun, and a Scud regiment there was expanded into a Scud Brigade. In June 1990, US satellite imagery reportedly revealed the construction of two missile launch sites near the Demilitarized Zone (DMZ). Although the locations were not revealed, they were probably Chiha-ri and Sariwŏn. There is another missile base near the DMZ at Shin'gye-kun, but Scuds were reportedly deployed to Shin'gye-kun in 1988. The two launch sites were believed to be for Hwasŏng-5 [Scud-B] missiles. According to Eya Osamu, a Japanese journalist, Sariwŏn is the headquarters for a Scud Missile Brigade. It appears likely that Sariwŏn is the headquarters for a Scud brigade headquarters considering the deployment of 36 TELs and its relative proximity to Pyongyang.

Sources:
[1] Pukhan, Idong Scud Palsa Sŏnggong/Sŏ An'gibujang," Taehan Maeil, 5 October 1991, p. 2, in KINDS, www.kinds.or.kr;
[2] Joseph Burmudez, "Ballistic Ambitions Ascendant," Jane's Defence Weekly, vol. 19, no. 15, 10 April 1993, pp. 20-22;
[3] Eya Osamu, Kim Sei Nichi Daizukan (Tokyo: Shogakkan, 2000), pp. 11-12;
[4] Bill Gertz; "North Korea Builds 2 Missile Launch Sites," Washington Times, 14 June 1990, in Lexis-Nexis Academic Universe, http://web.lexis-nexis.com;
[5] "Puk, Changgŏri'p'o Chŏnbangjiyŏk Chŭnggangbaech'i/Kukpangbu," Taehan Maeil, 25 June 1993, p. 3, in KINDS, www.kinds.or.kr.