In the beginning of 1968, the first "B" model Chinooks arrived in Vietnam and were assigned to the 178th AHC. By March the replacement was complete, and the "Boxcars" were the first completely operational "B" model Chinook company in Vietnam. With the introduction of the "B" model Chinook in Vietnam came "Project Tree". This operation was designed to equip all existing "B" model Chinooks with the more powerful L-7C engine. This project is still in progress all but two of the 178th Chinooks had these new engines by January 1969, and this has greatly increased its capacity as a medium lift helicopter company. The 178th was the first Chinook company to lift a complete 155 howitzer, which weigh in excess of 12,500 pounds. In 1968 the 178th participated in operation Kham Duc, one of the major operations undertaken by the 178th. During this operation the 178th evacuated approximately 700 of the 1700 American and allied troops trapped at camp Kham Duc. All of this was 12 May 1968. Although two ships were lost during the operation no lives were lost. The heroism displayed by the flight crews resulted in 7 individuals being recommended for the Silver Star. In February 1968 the 178th logged its 20,000 flying hour and 11 months later it was the second Chinooks company in Vietnam to log its 30,000th flying hour. Since the day the 178th joined the Americal Division its commitments have steadily increased. The Boxcars alone have supported the 1st Infantry Division, 25th Infantry Division, 173rd Airborne Brigade, 4th Infantry Division, 196th Light Infantry Brigade, 11th Armored Cavalry Regiment, 101st Airborne Division, 198th Infantry, U.S. Special Forces, the Australian Task Force, the Army of Vietnam, the US Aid Mission, and the Americal Division Artillery. On 1 October 1969 the 178th ASHC was placed under command of the 14th Aviation Battalion (Combat) where it has remained to the present.

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