9th Aerospace Defense Division

9th Space Division
Phased array missile detection radar at RAF Fylingdales
Active	1949–1950, 1954-1958, 1961-1968, 1990-1991
Country	United States
Branch	United States Air Force
Role	Command of aerospace defense units
Insignia
9th Space Division emblem (approved c. 4 September 1990)
9th Aerospace Defense Division emblem
9th Air Division emblem

The 9th Space Division (9th SD) is an inactive United States Air Force organization. Its last assignment was with Air Force Space Command, being stationed at Patrick Air Force Base, Florida. It was inactivated on 1 October 1991.

The organization has had several periods of activation over its lifetime. Initially established in April 1949 as the 9th Air Division (Tactical) under Fourteenth Air Force, Continental Air Command at Pope Air Force Base, North Carolina, the command had no units assigned but was to act as a headquarters over tactical units. It was inactivated in August 1950.

It was redesignated 9th Air Division (Defense) and reactivated in October 1954 by Air Defense Command (ADC) and assigned to Western Air Defense Force (WADF) at Geiger Field, Washington, taking over control of air defense units in eastern Washington, Oregon and Idaho from the 25th Air Division (AD), after the 25th AD was realigned over the Washington and Oregon coastal area west of the Cascade Mountains. It participated in the United States Air Force collateral mission of antisubmarine warfare and administered, equipped, and trained for combat. It was inactivated in 1958 when the Spokane Air Defense Sector was established by ADC to take over its responsibilities.

The third incarnation of the organization began in 1961 with its reactivation as the 9th Aerospace Defense Division was associated with the North American Aerospace Defense Command by ADC, assuming responsibility for the Ballistic Missile Early Warning System, the Missile Defense Alarm System, the Space Detection and Tracking System (SPADATS), the NORAD combat operations Center, the Bomb Alarm System, and the Nuclear Detonation System.