It’s been 45 years since the last U.S. troops came home from Vietnam—but veterans and the federal government are still litigating Agent Orange claims.

Earlier this month, the U.S. Supreme Court granted cert in a pro bono appeal by lawyers from Latham & Watkins on behalf of a man who served on the destroyer escort U.S.S. Roark during the Vietnam War. Robert H. Gray blames his exposure to the herbicide’s dioxin for a host of medical problems, including type 2 diabetes, neuropathy and heart disease.