sentences:  The 24th AD was responsible for the air defense of a large area of the upper Great Plains from the 115th meridian west eastward to the 97th meridian west; from the 49th parallel north south to the 41st parallel north.This area encompassed most of Montana, Wyoming, North and South Dakota and most of Nebraska.It was also the command organization for the Semi Automatic Ground Environment (SAGE) Data Center (DC-20) at Malmstrom.