1st Battalion, 21st Field Artillery Regiment (United States)

Regiment · United States · inactive December 31, 1921 – 1923 · inactive December 31, 1946 – 1948 · inactive December 31, 1957 – 1960 · inactive December 31, 1979 – 1986

Fought in Vietnam War Wikipedia

Movements

July 28, 1914 – November 11, 1918 World War I
September 1, 1939 – September 2, 1945 World War II
November 14–18, 1965 Battle of Ia Drang