Since 2008, the number of heat strokes in the U.S. military has risen nearly 60 percent, and every year at least one soldier succombs to heat in largely avoidable deaths. InsideClimate News and NBC News spent nine months investigating heat deaths and heat-related illnesses in the military and the Pentagon’s uneven efforts to safeguard war fighters. We found that despite acknowledging the risks of climate change for years, the military is unprepared.