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Keith Lee, an RAF employee puts the finishing touches to a Second World War Spitfire Mk XVI, in Horse Guards Parade in London, Thursday, March 31, 2016. A Pop-Up RAF aircraft museum was on Horse Guards Parade to mark the centenary of the Royal Air Force.The planes were transported to the capital ahead of the 100th anniversary of the RAF. The display was organised by the RAF Museum to highlight the way the air force has 'shaped the modern world and touched the lives of millions'. (AP Photo/Kirsty Wigglesworth) ORG XMIT: LKW112