Members of the volunteer reserve forces are able to maintain their details on the joint personnel administration (JPA) system or through unit administration staff. It is the responsibility of the individual reservist to ensure their personal details are up-to-date.
Members of the regular reserve, which consists of some 43,600 former members of the regular forces who have a liability for mobilisation, are required under service regulations to inform the Ministry of Defence of any changes in personal details, such as name, address or next of kin. The employment termination process allows the address to be stored on JPA. In addition, the Army and the Royal Navy use an annual reporting letter as a method of updating regular reservists contact details held on JPA. The RAF discontinued the annual reporting letter in 1999 which had no effect on its ability to mobilise the required number of reservists for operations in Iraq in 2003.