In PlayerUnknown’s Battlegrounds game, the Fever and Militia crates will be active with the update on February 22, 2018. They are published in order to mark the start of a new season. In which, you are able to get the Militia at random through weekly gifts (together with Survivor, Biker, and more). Meanwhile, the Fever will show separately. You can own them by choosing BP. You can experience patch notes if you want to seek more explanation on these special boxes, for example, drop rate, contained power-ups, etc.