United States chemical weapons program

The United States chemical weapons program began in 1917 during World War I with the creation of the U.S. Army's Gas Service Section and effectively ended 73 years later in 1990 with the country's adoption of the Chemical Weapons Convention (signed 1993; entered into force, 1997). Destruction of stockpiled chemical weapons began in 1986 and was completed on July 7, 2023.