The Washington Post reports on new Pentagon-sponsored research on energy efficiency, and the hard realities that now make it a priority:

[A]bout half of the U.S. military casualties in Iraq and Afghanistan are related to attacks with improvised explosive devices on convoys, many of which are carrying fuel. As of March 20, 3,426 service members had been killed by hostile fire in Iraq, 1,823 of them victims of IEDs.