Why did the US Army end the use of Air Cavalry that was so prevalent in the Vietnam War?

The US Army ended the use of Air Cavalry primarily due to changes in warfare tactics and the evolving nature of military operations. After the Vietnam War, the focus shifted towards more conventional ground warfare and joint operations, which reduced the need for the rapid mobility and close air support that Air Cavalry provided. Additionally, advancements in technology and the development of new combat vehicles further diminished the operational role of Air Cavalry units. As a result, the Army restructured its forces to adapt to modern combat environments.