For fuel efficiency achieved, the Pentagon is considering to adopt a hybrid engine. However, the Pentagon also require a form of vehicle which it is not too big and heavy. So the helicopter could transport him to wear a sling to be moved. Surely, something can not be done with a antimine vehicle (Mine-Resistant, Ambush Protected / MRAP) that exist today.

it is outstanding issues, in recent days, the Pentagon will announce who will receive a contract project of making their dreams for these development and manufacture of MRAP. There are three companies reportedly competing for this project. This information is provided to one source of wired.com.
In recent days, according to the blog networking site, the Pentagon was rumored to be announced who would receive the contract as a supplier of smart tactical vehicles dream of a multi-ability.