This legislation, known as the "Restoring Lethality Act," seeks to systematically eliminate all statutory provisions concerning diversity, equity, and inclusion (DEI) within the Department of Defense. It specifically repeals the position of the Chief Diversity Officer for the Department of Defense and rescinds mandates for strategic plans related to diversity and inclusion. The bill also amends various sections of title 10, United States Code, to remove requirements for diversity in military selection boards, including those for promotions. Furthermore, it strikes provisions that mandate the collection and reporting of data disaggregated by gender, race, and ethnicity, and eliminates requirements for certain human relations training content, replacing it with a focus on honor, excellence, courage, and commitment. Additional provisions repealed include those related to diversity in military leadership, the identification of gender or personal pronouns in official correspondence, and the establishment of senior advisors for diversity and inclusion across military departments and the Coast Guard. These changes collectively aim to remove DEI-specific roles, reporting, and training from the Department of Defense's statutory framework.