This encompassed an area consisting of the states of Washington, Oregon, Idaho, Montana and Wyoming and the western parts of North and South Dakota as well as Nebraska.

Later that year, on 15 September HQ 25th AD was moved from Silver Lake to McChord Air Force Base, near Tacoma, Washington.

[1] Beginning on 1 January 1958, it the command organization for the Seattle Air Defense Sector Semi Automatic Ground Environment (SAGE) Data Center (DC-12) at McChord.

During the Cold War era, the 25th AD equipped, administered, trained and provided air defense combat ready forces within the northwestern United States.

In addition, the division and its subordinate units also participated in numerous tactical air defense training exercises.

[1] In the late 1950s, the Division also controlled United States-built radar stations in Western Canada as part of the Pinetree Line.