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The United States Air Force is possibly the largest single user of jet fuel, consuming about 2.5 billion gallons a year. It is now taking steps to reduce dependency on fossil fuel. It has set a target of using half of its fuel as 50-50 blend of biofuel and conventional Jet Propellant-8 (JP-8)by 2016, or a quarter of its consumption as biofuel (about 625 million gallons). It is also trying to reduce operational jet fuel consumption by improving efficiency. The current goal is a reduction of 10 percent by 2015.
For a start, two F-16 Fighting Falcon fighters have been flying witha biofuel called Hyrdoprocessed Renewable Jet (HRJ)fuel, which is refined from the oil of the camelina plant. The camelina plant needs little water and can be grown in harsh condition. The HRJ fuel supplied by Sustainable Oils, a joint venture between Targeted Growth, an agricutural bioscience company, and Green Earth Fuels, a biofuel producer.

The F-16 trial is conducted by the USAF Research Laboratory, to find a fuel blend that meets the fuel properties required by USAF. Fuel properties such as the flash point and freezing point would affect the operations of combat aircraft.
The trial is expected to consume 107,000 gallons of biofuel to collect data for the subsequent certification of F-16 for biofuel operations. Several other aircraft including the C-17 Globemaster III, have been certified for unrestricted use of biofuel in a 50-50 blend with JP-8. Such trials will go a long way towards reducing the use of fossil fuel and hopefully, a reduction in green gas emission.