The main purpose of this legislation is to empower the U.S. Secretary of Defense to support programs that help foreign security forces combat illegal, unreported, and unregulated fishing, often referred to as IUU fishing. This initiative aims to enhance global maritime security and protect marine resources by building the capabilities of partner nations to address these fishing issues. Key provisions of the legislation include the authorization for the Secretary of Defense to conduct or support capacity-building programs specifically aimed at countering IUU fishing.