[2] The division was responsible for the interceptor and radar units within an area that covered parts of Nebraska, Oklahoma, Arkansas, Illinois, Iowa, and virtually all of Kansas and Missouri.

[3] On 1 October 1959 ADC activated the Sioux City Air Defense Sector and its Semi Automatic Ground Environment (SAGE) DC-22 Direction Center and assigned it to the division.

[citation needed] In addition to the active duty interceptor and radar units, the division supervised Air National Guard units that flew interception sorties using (among other aircraft) McDonnell F-101 Voodoos and Convair F-106 Delta Darts.

It was inactivated in 1967[1] as part of an ADC consolidation of intermediate level command and control organizations, driven by budget reductions required to fund USAF operations in Southeast Asia.

[citation needed] The 20th Air Division was activated for a third time in November 1969 under Aerospace Defense Command (ADCOM).

[10] This article incorporates public domain material from the Air Force Historical Research Agency Further reading