The main purpose of this legislation is to enhance access to workers' compensation for civilian federal employees who have been exposed to toxic burn pits during their work. It aims to recognize the health risks associated with these exposures and ensure that affected employees can receive the necessary support and compensation for related health issues. Key provisions of the legislation include the establishment of a presumption that certain diseases are connected to employment for eligible federal employees who have worked in contingency operations since August 2, 1990.