The last light tank the Army had actually wasn’t bad
The US Army has been searching for a suitable light tank to support airborne troops. Its last successful model was the M551 Sheridan, but even that had limitations. The Army has since explored other options, including the M10 Booker, M56 Scorpion, and M50 Ontos, but these have been canceled or discontinued.
The requirements for a new light tank are challenging, with the need for it to be air-droppable, amphibious, and capable of withstanding Soviet main battle tanks. This means it must be under 17 tons while also having sufficient armor and a powerful gun. Further details on the Army's quest for a light tank are available from Task & Purpose.