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March 31, 2010 (21 images)

Updated: Dec. 31, 1969 at 7:00 PM
1 of 21
U.S. President Barack Obama looks at an F-18 "Green" Hornet, which is being tested to run off biodiesel, after delivering remarks on energy security at Joint Base Andrews Naval Air Facility in Maryland on March 31, 2010. UPI/Kevin Dietsch
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