sentences:  During the 1950s the AOR of the 25th AD changed frequently, but its core area always included the area of Washington State west of the Cascade Mountains.On 1 January 1951, Air Defense Command regained major command status, and the 25th AD was one of four Air Divisions assigned to the new command.Later that year, on 15 September HQ 25th AD was moved from Silver Lake to McChord Air Force Base, near Tacoma, Washington.