OpenAI co-founder Greg Brockman has emerged as one of Donald Trump’s largest financial backers — more than Miriam Adelson — while pouring tens of millions into shaping U.S. policy and fighting A.I. regulation. As OpenAI pushes the Pentagon toward a future of A.I.-powered surveillance, targeting systems, and automated warfare, technologies already deployed by Israel during its assault on Gaza are becoming a blueprint for America’s next generation of military operations.