When Palmer Luckey cofounded the defense startup Anduril in 2017, three years after selling his virtual reality startup Oculus to Facebook, the idea of a twentysomething from the tech industry challenging the giant contractors that build fighter jets, tanks, and warships for the US military seemed somewhat far-fetched. Seven years on, Luckey is showing that Anduril can not only compete with those contractors—it can win.Last month, Anduril was one of two companies, along with the established defe...