The main purpose of this legislation is to enhance the security of transporting freight for the Department of Defense (DoD). It aims to ensure that only trustworthy motor carriers are involved in the transportation of sensitive military cargo, particularly by preventing connections with Chinese military companies. Key provisions of the legislation include a certification requirement for motor carriers. Before they can be awarded contracts to transport DoD freight, these carriers must certify that they are not owned or controlled by any entity on a specific list of Chinese military companies.