Get all our news and commentary in your inbox at 6 a.m. ET. email The Next War’s ‘Butcher’s Bill’ Will Match WWII’s—Unless the US Adapts, Milley Says NATO militaries must master new technologies, from AI to next-gen long-range fires, within 15 years, Joint Chiefs chair warns. New technologies are so altering the “character of war” that the United States and allies who don’t hold the advantage may suffer another slaughter on par with World Wars I and II, warned the U.S. military’s top officer. “If we don't get there first-est with the most-est, and we don't put the pedal to the metal and do this right over the next 10 to 15 years, we are condemning a future generation to what happened 76 years ago,” Joint Chiefs Chairman Gen. Mark Milley said Thursday, at the NATO’s new operational headquarters, Joint Force Command Norfolk in Virginia.