The 229th was part of the 11th Air Assault Division (Test) in the early 1960's and helped test helicopter air mobility tactics. In 1965 they became part of the 1st Cavalry Division when the division was activated. The 229th landed in Vietnam in September 1965, and by November was involved in the first large-scale helicopter air assault action (LZ X-Ray in the Ia Drang Valley). The 1st Cav Division withdrew from Vietnam in April, 1971. However, a 3rd Brigade (separate) of the 1st Cav was organized at that time and stayed in Vietnam (III Corps) until June, 1972. The 229th served with the 3rd Brigade until its departure.
