In an effort to find secondary and sustainable fuel sources, the U.S. military has just ordered 600,000 gallons of fuel made from a variety of materials such as animal corpse grease, weeds or algae. The fuel will be provided by contractor Honeywell.
Honeywell says the Air Force will buy 400,000 gallons of the fuel and the Navy will buy the remaining 190,000 gallons. The U.S. Air Force is also in the process of making some of its aircraft run on coal.
The exploration of alternative fuels by the military is...fueled :D by a desire to have a secondary supply of energy in the event that a war or other unforeseen event cuts off the regular supply of traditional fuels.