In a federally funded initiative, DARPA is testing a flexible exoskeleton that has been developed for use by American servicemen and women. Rather than the "Iron Man" version of an exoskeleton, the direction instead has been toward flexibility. For more information, see the link at: http://www.msn.com/en-us/news/technology/darpa-tests-exoskeletons-on-soldiers/ar-AAeDs4x.
All I know is that, as a former Infantry grunt, I wouldn't have minded a little electronic help with the rucksack.
-- Rev. Jim Purcell