The act creates a presumption of service connection for a range of diseases that may arise from exposure to toxins at the Pentagon Reservation during the period beginning on September 11, 2001 . Covered veterans are defined as those who performed active service at the Pentagon between September 11 and November 19, 2001, and the list of diseases includes: Asthma Chronic obstructive pulmonary disease Emphysema Tracheomalacia Cancer of any type Cardiovascular disease of any type Skin disease of any type Respiratory disease of any type Any other condition the Secretary deems linked to a listed toxin The VA will treat these illnesses as incurred or aggravated during service even if no evidence of the disease existed at the time of service. The bill also allows the Secretary to add additional illnesses through regulation, ensuring the presumption remains responsive to new scientific findings.