 As of 1 January 2015, the Royal Air Force numbered some 34,200 Regular and 1,940 Royal Auxiliary Air Force personnel, giving a combined component strength of 36,140 personnel.In addition to the active elements of the Royal Air Force, (Regular and Royal Auxiliary Air Force), all ex-Regular personnel remain liable to be recalled for duty in a time of need, this is known as the Regular Reserve.In 2007 there were 33,980 Regular Reserves of the Royal Air Force, of which 7,950 served under a fixed-term reserve contract.