The Reapers are targeting training centers, and your mission is to draw their fire and attention
Operation Shieldwall, another action-packed Multiplayer Weekend for Mass Effect 3, is running from Friday, May 25 at 6:00PM PST until Monday, May 27 at 5:00PM PST, on PlayStation 3, Xbox 360 and PC. You must rally your allies for this Weekend with the following challenges: Allied Goal - promote 50,000 characters - all players awarded a Victory Pack (high chance of containing a Rare weapon); Squad Goal - promote 3 characters - squad members awarded a Commendation Pack.
Remember to set the "Upload Gameplay Feedback" setting to "On" in the online options to be able to participate in this N7 Operation. Also, note that due to a known issue, PlayStation 3 users will not see the promotion screen but they will be participating in Operation Shieldwall and will be rewarded.