<Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (May 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (May 2012) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Royal Flying Corps </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Active </Th> <Td> 13 April 1912--1 April 1918 </Td> </Tr> <Tr> <Th> Disbanded </Th> <Td> merged into Royal Air Force (RAF), 1918 </Td> </Tr> <Tr> <Th> Country </Th> <Td> British Empire </Td> </Tr> <Tr> <Th> Allegiance </Th> <Td> King George V </Td> </Tr> <Tr> <Th> Branch </Th> <Td> British Army </Td> </Tr> <Tr> <Th> Size </Th> <Td> 3,300 aircraft (1918) </Td> </Tr> <Tr> <Th> Motto (s) </Th> <Td> Latin: Per Ardua ad Astra "Through Adversity to the Stars" </Td> </Tr> <Tr> <Th> Wars </Th> <Td> First World War </Td> </Tr> <Tr> <Th_colspan="2"> Commanders </Th> </Tr> <Tr> <Th> Notable commanders </Th> <Td> Sir David Henderson Hugh Trenchard </Td> </Tr> <Tr> <Th_colspan="2"> Insignia </Th> </Tr> <Tr> <Th> Roundel </Th> <Td> </Td> </Tr> <Tr> <Th> Flag </Th> <Td> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Royal Flying Corps </Th> </Tr>

When did the royal flying corps became the raf