The main purpose of this legislation is to allow certain retired or disabled members of the military to contribute to the Thrift Savings Plan (TSP) after they have separated from service. The TSP is a retirement savings plan similar to a 401(k) that helps federal employees and members of the uniformed services save for retirement. This change aims to enhance financial opportunities for these individuals, supporting their long-term financial security. Key provisions of the legislation include the eligibility criteria for contributions to the TSP.