In the years following the Crimean War three corps can be identified as the direct predecessors of the RAOC. The Military Store Department (MSD) created in 1861 granted military commissions and provided officers to manage stores inventories. In parallel a subordinate corps of warrant officers and sergeants, the Military Store Clerks Corps (MSC), was also created to carry out clerical duties. These small corps (235 officers in the MSD and 44 MSC) were based largely at the Tower of London, Woolwich Arsenal and Weedon Bec, but were also deployable on active service. They were supplemented in 1865 by the establishment at Woolwich of a Military Store Staff Corps (MSSC) to provide soldiers: initially 200-strong, it had more than doubled in size by 1869, with units in Portsmouth, Devonport, Aldershot, Dublin and Chatham as well as at Woolwich and the Tower.