Lingering health and legal fallout from the spraying of Agent Orange during the late 1960s in Korea is the background of a lawsuit filed Tuesday in the U.S. Court of Appeals for the Federal Circuit by national veterans organizations against the Department of Veterans Affairs.

The lawsuit, McKinney v. Secretary of Veterans Affairs, contends that hundreds, perhaps even thousands, of veterans who served along Korea’s demilitarized zone (DMZ) and who were exposed to the toxic chemical are being wrongfully denied disability benefits.