.
This could help
http://www.fas.org/sgp/crs/natsec/R40459.pdffuel supplies and purchase are the responsibility of the Defense Energy Support Center (DESC), under the command of the Defense LogisticsAgency (DLA),
it has the mission of purchasing fuel for all of DOD’s services and agencies,
both in the continental United States (CONUS) and outside (OCONUS)
The cost of petroleum products is a big headache for the DOD , the price keep rising
a grievously expensive item is jet fuel , the main subject of the above report
since the US dominance in conventional warfare is largely based on air supremacy
that's a big worry .
the most encouraging development of recent years has been the increased deployment of unmanned drones , they are much cheaper and it could be argued , much better at controlling the sky
a Darwinian pressure will probably occur , with increased niche specialization , appearance of predator prey relationship and the extinction of obsolete rival design such as manned observation planes
the Navy is petroleum cheap ( relatively ) due to its deployment of a large amount of nuclear reactors
as propulsion
The DOD has been going green of course , with little of value except as public relation exercise
.