Emma Newburger, CNBC »

Water shortages could become a primary source of friction or conflict between U.S. military overseas and the countries where troops are based, the Department warned. It also expects that political efforts to mitigate food and water shortages will result in more frequent physical and cyber terrorist attacks from unknown third parties.

Extreme weather events made worse by climate change, including droughts, storms and floods, have already cost the Department billions of dollars, according to the plan. An increase in extreme weather events will create more demand for U.S. troops while damaging military bases, degrading mission capabilities and putting service members at risk.

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