sentences:  While serving with the 1st Cavalry, Mason was involved in several battles and other missions, including the Battle of Ia Drang, the Battle of Bong Son and Happy Valley.Mason transferred to the 48th Aviation Company (referred to as the 49th in his memoir) in May 1966.He continued to fly helicopters, including assault missions for the 101st Airborne in Dak To as part of Operation Hawthorne in June 1966.