From June 2nd to 9th the Double XP event will be held in Caliber. During these days each conquered round, checkpoint and frontline in the Clearing, Showdown, Special Operation, Hacking and Frontline modes will give the player double XP. In addition, the account receives double XP during the event as well.
It's simple: play as you normally do, while progressing twice as fast. The event lasts until maintenance on Wednesday, June 9th.
The amount of XP during the event is shown on the pictures.