I'm trying to build the evolution of the REME, RAOC, RASC and RAMC units of the British Infantry Division from September 1939 to May 1945. I managed to list all the changes that occurred throughout the years, but I couldn't find the exact date (month and year) on which the establishments were officially modified. The Infantry Division in September 1939 had the HQ, RASC (Ammunition, Petrol and Supply Companies) and separate RAMC units (3 Field Ambulances and a Field Hygiene Section). Following the Battle of France (summer 1940), the HQ, RAOC was added, which comprised Light Aid Detachments, a Divisional Ordnance Workshop, a Divisional Ordnance Field Park, a Mobile Laundry and Decontamination Unit, a Mobile Bath Unit and a Salvage Unit. During 1941 2 RAMC Field Dressing Sections were added; the RASC Ammunition, Petrol and Supply Companies were replaced by 3 Infantry Brigade Companies and a Divisional Troops Company; the Mobile Laundry and Decontamination Unit, Mobile Bath Unit and Salvage Unit were made Corps Troops. In early 1942 RAOC Light Anti-Aircraft Regiment Ordnance Workshop Subsections were added. In late 1942 the HQ, REME was added, which took command of the former RAOC units: various Light Aid Detachments, a LAA Regiment Workshop and 3 Infantry Brigade Workshops. The RAOC Divisional Ordnance Field Park was passed to Corps Troops, although in early 1944 it was again assigned to the division. Can anyone correct and complete with dates and additional infos? Thank you.