Holy shit!!
"Rather, DARPA is interested in forcing soldiers' bodies to metabolize their own fat reserves, eliminating the need for food. It would like to overclock muscle mitochondria, increasing output beyond levels that the skeleton can withstand. It would like to suppress the painful signs of fatigue, so that soldiers can be pushed beyond the limits of human endurance without realizing it, at least until something breaks."
http://www.theregister.co.uk/2004/02/21/darpa_creating_a_race/
http://www.darpa.mil/dso/solicitations/baa03-02mod2.htm

"Rather, DARPA is interested in forcing soldiers' bodies to metabolize their own fat reserves, eliminating the need for food. It would like to overclock muscle mitochondria, increasing output beyond levels that the skeleton can withstand. It would like to suppress the painful signs of fatigue, so that soldiers can be pushed beyond the limits of human endurance without realizing it, at least until something breaks."
http://www.theregister.co.uk/2004/02/21/darpa_creating_a_race/
http://www.darpa.mil/dso/solicitations/baa03-02mod2.htm