158 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was formed at Dunfermline in May 1942. It became a non-mixed Regiment in March 1946. The Regiment served in Anti-Aircraft Command for its whole existence. 158 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was considered a new War Formed unit in January 1947 and re-designated in the April as 111 Heavy Anti-Aircraft Regiment RA.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
|May 42||Formed||Dunfermline, Fife, UK|
|Aug 42||3 Anti-Aircraft Division, 36 Anti-Aircraft Brigade||Edinburgh, UK|
|Aug 43||6 Anti-Aircraft Group, 51 Anti-Aircraft Brigade||Edinburgh, UK|
|Nov 43||6 Anti-Aircraft Group, 42 Anti-Aircraft Brigade||Edinburgh, UK|
|Apr 44||5 Anti-Aircraft Group, 30 Anti-Aircraft Brigade||East Midlands, UK|
|Re-organised as a non-mixed regiment in 1946|
|Jun 42||540 (Mixed), 541 (Mixed), 548 (Mixed),|
|Sep 42||540 (M), 541 (M), 548 (M), 572 (M)|
|Dec 44||540 (M), 541 (M)|
|Feb 45||510 (M), 540 (M), 541 (M)|