The main purpose of this legislation, known as the Veterans for Mustangs Act, is to update the management of wild free-roaming horses and burros in the United States. It aims to implement humane fertility control measures to help manage their populations effectively and to create training opportunities for military veterans to assist in these management efforts. Key provisions of the Act include a requirement for the Secretary of the Interior to use non-surgical, safe fertility control methods to manage the populations of wild horses and burros.