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An army needs water to operate, but it's a pain to tote the stuff around. So Darpa is looking at ways to pull it out of thin air.

The goal of the Water Harvesting Program is to develop and demonstrate technologies to potentially eliminate at least 50 percent of the minimum daily water supply requirement (7qts/day) of the Special Forces, Marine Expeditionary Units, and Army Medium-Weight Brigades. The success of this program will have a global impact on the policies of the DoD by providing potable water within the reach of the warfighter any place, any time. Currently the program is investigating approaches to "water from air" concepts.