The alternative jet fuel debate is a chocolate mess of politics and bad gouge.
11K gal for RDT&E..
"Ops checked"= certified throughout entire envelope, with the exception of MQ-9 and CV-22, using up to a 50-50 synthetic blend based on coal/natural gas and JP-8. The carbon footprint of these blends is greater than standard JP-8 which the DoD, by law, can't buy for anything but R&D. That law was passed in '07. Blend in some biomass and the carbon footprint decreases,but you have to test it first.
As we speak there's a "Great Green Fleet" in RIMPAC burning 450K gal of biofuel at $26/gal, and they want to repeat the demo in 2016 for an entire deployment. Not sure what that will accomplish other than to prove it can be done as long as cost is no object.
Biofuels aren't ready for prime time, but you've got to start somewhere. USAF has the right idea: certify the fleet w/alternative fuel and be ready to buy when it becomes cost competitive.
We're in the Navy's frag pattern because of energy politics.