Presumably in honor of the 2012 Summer Olympics, currently being held in a Reaper-free London, England, BioWare is launching Operation Olympus in Mass Effect 3.
The goal of this special multiplayer challenge is to survive to extraction on Firebase London - part of the free Mass Effect 3: Earth DLC released last month.
Squad Goal: Full extraction from Firebase London using any Kit on any difficulty
Allied Goal: Using any Kit/ Map combination against any enemy, complete wave 10 on a combined community total of 200,000 Bronze missions, 175,000 Silver missions and 70,000 Gold missions.
Special Circumstance: None
Squad Goal Success: All squad members awarded a Commendation Pack
Allied Goal Success: All players awarded a Victory Pack
Those are your orders, soldier. An allied ship is en route to London for extraction. This mission commences on August 10th.