Army Vice Chief of Staff Gen. Peter Chiarelli last week expressed frustration with the Defense Department's slow acquisition process, which he said was preventing the service from rapidly adopting technology that could make it more energy-efficient. "If there's something that concerns me greatly . . . it's our inability to take advantage of rapid technological change," he said at an Oct. 13 energy forum at the Pentagon. "I worry that our acquisition system is too slow." If the Army planned...