This weekend's Mass Effect 3 multiplayer event, Operation: OLYMPUS, kicks off today and will run until Sunday, August 12.
What do you need to do? To earn a Commendation Pack, all you need is a full extraction on Firebase London, using any Kit on any difficulty. Easy, right? To get a Victory Pack, the community will need to successfully complete 10 waves (no mention of extraction) across multiple difficulties. The goal is set at 200,000 Bronze missions, 175,000 Silver, and 70,000 Gold. No need to torture yourselves with Platinum, and any Kit/map combo will work.
Keep in mind that "Reaper activity has been reported around London." This could mean you'll spot Reapers regardless of which enemy type you choose.