US military men at a naval base on the Indian Ocean atoll of Diego Garcia now have their energy demands dealt with by Otec, a system which uses seawater and a refrigerant-like ammonia to power a turbine.
Rumor has it that by 2020 the US army plans to use mostly clean energy sources during its drills and missions.
Moreover, it is expected that by 2016 Americans will be able to proudly introduce the general public to their Great Green Fleet, a carrier strike group partly powered by biofuels.
For the time being, some people find it a bit paradoxical that the US army shows such concern for the environment whilst it doesn't in the least shy away from wars that lead to human victims.