Operation Patriot, another action-packed Multiplayer Weekend for Mass Effect 3, is running from September 21th to September 23rd, BioWare announced. Word is: "Cerberus continues to put pressure on our troops, hindering our fight against the Reapers. Our allies have committed their top military units to target Cerberus’ most valuable assets: their Atlas Mechs."
You must rally your allies for this Weekend with the following challenges: Allied Goal - kill 600,000 Atlas Mechs on any map at any difficulty (Escort Drones travel speed reduced) - all players awarded a Victory Pack; Squad Goal - extraction on any difficulty with all squad members as the same non-human race. Requires 2 or more players in squad - all squad members awarded a Commendation Pack.
BioWare also revealed that a new rare weapon that can be unlocked for multiplayer: The Argus Assault Rifle (previously only available in single-player).