Thatcher Birthday Challenge Romashka 03.03.2019 2017, Charm, Weekly Challenges Reward Comments 20/06/2017 Thatcher Birthday Challenge overview Rainbow Six Siege – Thatcher Birthday Challenge Wish Thatcher a happy birthday with the Ubisoft Club Challenge. Win 20 rounds with S.A.S. to unlock the Thatcher Medallion charm. Thatcher Medallion charm