The Defense Authorization Act is a federal law passed annually by the United States Congress. It outlines the budget and expenditures for the Department of Defense and sets policies for military operations, personnel, and equipment. This act ensures that the military has the necessary resources to maintain national security and support its missions. Each year, the act is debated and amended, reflecting the changing needs of the military and the geopolitical landscape. It also addresses issues such as military pay, benefits for service members, and funding for various defense programs, ensuring that the armed forces are well-equipped and supported.