A radical powered exoskeleton under development for use by the US military is to be fitted with fuel-cell power supplies which will increase its endurance from hours to days - and furnish juice for the burgeoning load of electronics carried by modern soldiers, too. Global arms behemoth Lockheed, developing the Human Universal Load Carrier (HULC™) after buying the originating firm Berkely Bionics, announced this week that fuel-cell firm Protonex will "develop power supply concepts that will enable the HULC™ robotic exoskeleton to support 72+-hour extended missions". Here's a company promo vid about the HULC: