Rainbow Six Siege Free Weekend

A free weekend is underway on Steam for Tom Clancy's Rainbow Six Siege, the most recent installment in this tactical first-person shooter series. This is free to try until tomorrow, and the game and all its content are also on sale for up to half-off if you want to reenlist. Word is if you do so, all progression from the free period will carry over. Here's the pitch on the game:
Master the art of destruction and gadgetry in Tom Clancy’s Rainbow Six Siege. Face intense close quarters combat, high lethality, tactical decision making, team play and explosive action within every moment. Experience a new era of fierce firefights and expert strategy born from the rich legacy of past Tom Clancy's Rainbow Six games.