Drones have revolutionized warfare, and with relatively cheap technology posing a deadly threat, the U.S. military needs to adapt, former Marine William McNulty said. His venture-capital fund has invested in Ukrainian drone technology, which has evolved rapidly over the course of the war with Russia . Drones are now estimated to inflict around 80% of combat casualties on both sides, according to some estimates. "There's a real risk that the U.S. would lose its military supremacy if it doesn't