The ASC subsequently absorbed some transport elements of the Royal Engineers. In 1918, the corps received the "Royal" prefix for its service in the First World War and became the Royal Army Service Corps. It was divided into Transport and Supply Branches.
Before the Second World War, RASC recruits were required to be at least 5 feet 2 inches tall and could enlist up to 30 years of age (or 35 for tradesmen in the Transport Branch). They initially enlisted for six years with the colours and a further six years with the reserve (seven years and five years for tradesmen and clerks, three years and nine years for butchers, bakers and supply issuers). They trained at Aldershot