https://arstechnica.com/information-technology/2019/10/robo-tank-army-picks-contenders-for-robotic-combat-vehicle-competition/

On October 18, the National Advanced Mobility Consortium—an organization of industry and academic researchers contracted by the US government to develop autonomous ground systems for the military—announced the selection of four companies to build prototype light robotic combat vehicles for the US Army. These are "non-developmental" prototypes, meaning they're based on existing technologies that could be turned into deployable systems with relatively minor modifications.

The Robotic Combat Vehicle-Light (RCV-L) program is part of the Army Futures Command's Next Generation Combat Vehicle effort. It seeks to provide soldiers in mechanized infantry and armor units with robotic "wingmen" that extend their reach and effectiveness on the battlefield. The Army hopes to have prototypes of the RCV-L as well as a heavier vehicle (the Robotic Combat Vehicle-Medium) in full testing in 2020. Two of each design will be fielded as "platoons" for testing, with the goal of wide deployment of tankbots by 2028.