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Indiana Army National Guard Pvt. Trea Colon inspects her equipment during a field training exercise at Camp Atterbury and Muscatatuck. Sgt. Jeremiah Runser/U.S. Army via DVIDS hide caption

itoggle caption Sgt. Jeremiah Runser/U.S. Army via DVIDS

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Leo Thompson stands in front of his isolated home, where he has lived for 35 years, on the Navajo Nation reservation. Like an estimated 18,000 Navajos homes, his his isn't connected to the electrical grid — it's a half-mile from the nearest line — and until recently Thompson used a generator for power. Ibby Caputo/NPR hide caption

itoggle caption Ibby Caputo/NPR