The unit was provisionally activated in 1st June 1971 as Delta Regional Assistance Command Corps Aviation Company, provisional 'DRAC-CAC'. Provisional status was removed on 15th August 1971, and was re designated as the 18th Avn Company (corps).  

        On March 2nd I972, unit was relieved from 13th CAB control and assigned directly to 164th CAG as a separate unit.

        The 18th CAC (Corps Aviation Company) was the largest Aviation company in Vietnam, as well as the US Army.  It consisted of over 50 aircraft plus 500 officers and enlisted men.

        A part of the unit was assigned to carry Vietnamese Generals and their staffs.  In addition, operations were undertaken in Aircraft recovery, reconnaissance, surveillance missions.

        The main aircraft used by the 18th CAC were UH-IB, D,  AH-1G,  OH-6A, and CH47 - A, B, and Cs.