Despite Republican criticism over biofuel spending, the military is proceeding with its programs. Geiss said the Air Force expected to finish certification soon of the alternative fuels that appear to have the best chance of reaching commercial production in the coming years.

The Navy’s Green Fleet demonstration takes place on Wednesday, and the service is moving ahead with plans to help fund biofuel refineries.

“At the end of the day,” said Geiss, “if their program is successful, all of the services would benefit.”