121 (West Riding) Medium Regiment RA(TA) was formed by the conversion of 121 Field Regiment in January 1944. It went into suspended animation in April 1946 and was re-constituted as 321 (West Riding) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
|Jan 44||Formed from 121 Field Regiment||Felixstowe, Suffolk, UK|
|Jan 44||8 Army||Italy|
|Feb 44||Home Forces||UK|
|Apr 44||2 Army||UK|
|Jun 44||5 Army Group RA||NW Europe|
|Jan 44||275, 276|