An RQ-4 Global Hawk, like the one pictured here, completed a 32-hour flight test using an alternative fuel mixture, Nov. 23, 2010 at Edwards Air Force Base, Calif. The remotely-piloted aircraft is the last platform to be tested for certification to use Fischer-Tropsch Synthetic Paraffinic Kerosene fuel.

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An RQ-4 Global Hawk, like the one pictured here, completed a 32-hour flight test using an alternative fuel mixture, Nov. 23, 2010 at Edwards Air Force Base, Calif. The remotely-piloted aircraft is the last platform to be tested for certification to use Fischer-Tropsch Synthetic Paraffinic Kerosene fuel.

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Photo credit: © 508 collection / Alamy / Afripics
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