The American premium LT of Tier VII. There is no information about when and why the tank will be handed out as a reward. Most likely T71 CMDC will become available on the Public Test with 9.15 patch release.
It was designed as an air-transportable armored vehicle. Cadillac company developed the blueprints of the tank in 1952-1956 as a replacement of M41. In 1956, the project was cancelled because of insufficient funds and the construction bureau began working on T92. The prototype of T71 CMCD was never built.
These parameters can change according to results of the tests.