The riots and turmoil of October 1988 caused president Chadli Bendjedid to dismiss General Ayat, who was succeeded by General Betchine. His tenure saw major political change, beginning with the advent of a multi-party political system and the rise of the Islamist movement of the FIS. Betchine was then replaced by Mohamed Mediène in November 1990, who served until 2015. Following this, the Services changed its name once again, from DGPS to DRS. Outside observers have charged that Mediène was one of the junta of generals who forced the cancellation the 1991 elections which the Islamists were set to win, plunging the nation into a war against the Islamist, and greatly increasing the power of the military—and the DRS—in Algeria's government.