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Singapore, SINGAPORE: A F-35 Joint Strike Fighter jet (background) with its extension gadget on display at the Asian Aerospace 2006 show in Singapore 21 February 2006.The new warplanes like the stealth F-35 Joint Strike Fighter will continue to play a crucial role in combat despite the emergence of unmanned drones, US aerospace giant Lockheed Martin said. AFP PHOTO/ ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP via Getty Images)

Singapore, SINGAPORE:  A F-35 Joint Strike Fighter jet (background) with its extension gadget on display at the Asian Aerospace 2006 show in Singapore 21 February 2006.The new warplanes like the stealth F-35 Joint Strike Fighter will continue to play a crucial role in combat despite the emergence of unmanned drones, US aerospace giant Lockheed Martin said.  AFP PHOTO/ ROSLAN RAHMAN  (Photo credit should read ROSLAN RAHMAN/AFP via Getty Images)