This new book deals with a subject that will be close to the hearts of many aviation enthusiasts in that it is commemorating the gate guardians that for decades were a feature at the entrance to many RAF, Fleet Air Arm and Army bases. Who knows how many were inspired to take an interest in military aviation, to join the Air Cadets or even pursue a career in aviation by these potent symbols of Britain's military aviation heritage?Back in the 1970s and 1980s it was rare for a military aviation base in the UK not to be graced by a gate guardian and these airframes have always fascinated enthusiasts. Prominently located and usually kept in good condition, these retired aircraft allowed passers-by to see up close examples of historic and significant aircraft types, such as the Hurricanes and Spitfires which won the Battle of Britain. As time moved on, other retired aircraft took their places on these plinths, early military jets and helicopters among them.The book traces gate guardians on a location-by-location basis. It presents full histories of significant examples and details all aircraft that have been displayed at military establishments across Great Britain and its Crown Territories. As well as the fascinating aircraft, the book provides background on many long-forgotten military bases.Another feature of the books is the 'harvesting' of Spitfire and Hurricanes as 'extras' in the epic film Battle of Britain; the scheme that replaced original aircraft used as gate guardians with full-scale replicas, allowing the return of precious original airframes back to the skies. In addition, for the first time the histories and fates of the hundreds of aircraft used for instruction and display by Air Cadet squadrons since the early days of World War Two are detailed.On Guard is a wonderfully nostalgic journey back in time, copiously illustrated throughout and including colour images taken over a period of six decades.