In the 1930s re-armament and the mechanisation of the Army led to a redesign of the UK base. A Central Ordnance Depot (COD) and workshop to support vehicles, built on the site of the First World War National Shell Filling Factory, Chilwell, opened in 1937. The operation of this depot was notable in that it mirrored and tried to improve on best civilian practice at the time; this became a hallmark of RAOC development in the following decades. COD Branston was established in 1938, initially to serve as the Army's main clothing store, freeing up space at COD Didcot. At the outbreak of the Second World War there were five CODs: Branston, Chilwell, Didcot, Weedon and Woolwich.