was Henry Allingham, who died on 18 July 2009 aged 113. As of 1 January 2015, the RAF 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 RAF, (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 RAF Regular Reserves, of which 7,950 served under a fixed-term reserve contract. Publications since April 2013 no-longer report the entire strength of the Regular Reserve, instead they only give a figure for Regular Reserves who serve under a fixed-term reserve contract. They had a strength of 7,120 personnel in 2014. Figures provided by the International Institute for Strategic Studies from 2012 showed that RAF pilots achieve a relatively high number of flying hours per year when compared with other major NATO allies such as France and Germany. RAF pilots achieve 210 to 290 flying hours per year. French and German Air Force pilots achieved 180 and 150 flying hours across their fleets respectively. Officers Officers hold a commission from the Sovereign, which provides the legal authority for them to issue orders to subordinates. The commission of a regular officer is granted after successfully completing the 24-week-long Initial Officer Training course at the RAF College, Cranwell, Lincolnshire. To emphasise the merger of both military and naval aviation when the RAF was formed, many of the titles of officers were deliberately chosen to be of a naval character, such as flight lieutenant, wing commander, group captain, and air commodore. Other ranks Other ranks attend the Recruit Training Squadron at RAF Halton for basic training. The titles and insignia of other ranks in the RAF were based on that of the Army, with some alterations in terminology. Over the years, this structure has seen significant changes: for example, there was once a separate system for those in technical trades, and the ranks of chief technician and junior technician continue to be held only by personnel in technical trades. RAF other ranks fall into four categories: Warrant Officers, Senior Non-Commissioned Officers, Junior Non-Commissioned Officers and Airmen. All Warrant Officers in the RAF are equal in terms of rank, but the most senior Non-Commissioned appointment is known as the Warrant Officer of the Royal Air Force.