When did Barry Sadler first write the ballad of the green berets?

Barry Sadler first wrote "The Ballad of the Green Berets" in 1966. The song was inspired by his experiences as a U.S. Army Special Forces soldier during the Vietnam War. It quickly gained popularity and became an anthem for American troops, reflecting the bravery and sacrifice of the Green Berets. The song was released as a single in early 1966 and topped the charts later that year.