'GREEN HORNET' The Navy celebrates Earth Day by showcasing a supersonic flight test of the "Green Hornet," an F/A-18 Super Hornet strike fighter jet powered by a 50-50 biofuel blend over the Patuxent River, Md., April 22, 2010. The test, conducted at Naval Air Station Patuxent River, drew hundreds of onlookers, including Navy Secretary Ray Mabus, who has made research, development and increased use of alternative fuels a Navy priority. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 486780-X-HRQ83-973.jpg Photo Gallery