US military combines green and mean to fly drones on biofuels. The US navy's aggressive plan to replace a third of its huge fuel use with biofuels has now seen the unmanned aircraft, as well as ships and supersonic aircraft, trial the fuels. A BQM-74E aerial drone is launched from the USS Thach. The US Navy has flown drones using a 50-50 mix of biofuel and jet fuel... Guardian