From 2013 to 2015，there have been some distinctive features in the British defence policy. Firstly，British military reform was accelerating. Its military transformation has nowadays been unparalleled both in depth and strength since the end of Cold War，though several constraining factors were emerging. Secondly，Britain has withdrawn all its troops from Afghanistan，which signalled a temporary end of its large-scale overseas military operations. It has also dealt with a series of crises more practically. Thirdly，Britain continued to adhere to Anglo-American Special Relationship and European defence integration，and significantly upgraded its defence cooperation with Japan.