This year's April 1st special takes Gaijin's game to space, but also come with a special event that can end up with a very rare piece of military hardware, namely the Object 279 heavy tank. Back in 2016 and 2017, these special events involved ships and modern tanks, which were both added to the game since then.
https://www.notebookcheck.net/April-Fools-Day-2020-War-Thunder-goes-to-space.459682.0.html