Between December 3, 2012 and December 7, 2012 at 03:00 PST Operation Invader will be active. Curious what time this is in your area? Use this handy Time Zone Converter to help you out.
Earning the Invader medal in battle will reward you with an additional 1,000 experience.
This event is repeatable; you'll get the reward every time you meet the criteria while the event is active.
Good luck, tankers. Roll out!