What is inactivated?

Some articles on inactivated:

20th Reconnaissance Squadron
... on 26 April 1965 (not organized) Organized on 8 May 1965 Inactivated on 1 April 1973 Redesignated 20th Tactical Air Support Squadron, and activated on 1 October 1973 ... Inactivated on 30 September 1984 Consolidated with the 20th Troop Carrier Squadron on 19 September 1985 ... (remained inactive) Activated on 1 April 1990 Inactivated 31 December 1991 Activated and Redesignated 20th Reconnaissance Squadron on 14 Jan 2011 ...
100th Fighter Squadron - History - Lineage
27 December 1941 Activated on 19 February 1942 Re-designated 100th Fighter Squadron on 15 May 1942 Inactivated on 19 October 1945 Activated on 1 July 1947 ...
List Of United States Air Force Bomb Squadrons - Bomb Squadrons - Squadrons 600 To 699
... Bombardment Squadron (Heavy) Drew Field, FL B-17 Inactivated 1945 601st Bombardment Squadron (Heavy) Drew Field, FL B-17 Inactivated 1945 602d ... Sawyer AFB B-52H Inactivated 1994 645th Bombardment Squadron (Light) RAF Gosfield A-20 Havoc Inactivated 1945 646th Bombardment Squadron (Light) RAF Gosfield A-20 Havoc Inactivated 1945 ...
List Of United States Air Force Bomb Squadrons - Bomb Squadrons - Squadrons 400 To 499
... Squadron (Heavy) RAF Bassingbourn B-17 Inactivated 1945 402d Bombardment Squadron, Very Heavy Northwest Field, Guam B-29 Inactivated 1946 403d Bombardment Squadron, Medium Carswell AFB B-58 Inactivated 1961 ...