The 164th Aviation Group was activated in Vietnam in December 1967 and located in Can Tho. The 164th CAG had about 3700 personnel. Main infantry groups supported were the US 9th Infantry, the ARVN units and the 5th Special Forces. IV Corps was the delta area consisting of rice patties and swampy ground which was covered with water six months a year during rainy season. The corps was heavily populated, consisting of many small towns and villages. During the 1968 Tet offensive, aviation companies of the 164th CAG played vital and deciding roles in the liberation of Soc Trang, Can Tho, Bac Lieu, Vinh Long, and in preventing the VC from occupying many other major cities in the Delta.