Perhaps this explains why they're looking at fuel cells? My first thought on reading this was that it would resolve the problems of eating gas while standing still. My second thought is that JP8 is a fairly heavy fuel, and IIRC fuel cells extract usable energy only from the hydrogen; the carbon is thrown away. I'm more than a little curious as to the total system efficiency compared to a diesel or turbine engine.
IIRC, I read the info about a return to a diesel IC engine before fuel cells became popular. Then again, the Army has a vibrant R&D budget and mayber they really were thinking that far ahead?