The main purpose of this legislation is to provide additional support to veterans who served at Karshi Khanabad Air Base in Uzbekistan and were exposed to toxic substances during their service. The goal is to simplify the process for these veterans to receive benefits for certain health conditions that may arise as a result of their exposure. Key provisions of the legislation include the establishment of a presumption of service connection for a wide range of diseases that veterans may develop after serving at the air base.