Defense Secretary Pete Hegseth is rushing to reshape the military, in part by shifting money and making cuts. He has banned efforts in the Defense Department to promote diversity, and strongly backed President Trump's decision to fire Gen. Charles Q. Brown Jr., the second Black chairman of the Joint Chiefs of Staff. He has welcomed Elon Musk's Department of Government Efficiency to review Pentagon programs for what he calls 'fraud, waste and abuse.' Mr. Hegseth has also ordered senior military and Defense Department officials to draw up proposals to reallocate $50 billion in this year's budget, or about 8 percent. The Pentagon would go through this process annually for the next five years. In addition, the Pentagon has said it would fire 5,400 civilian probationary workers, in the first of what officials say is likely to be a wave of much larger layoffs at the government's biggest agency.