Army of Two - 2008 first week xbox 360 USA sales (3 days) - 255,906
http://www.vgchartz.com/weekly/39516/USA/
Army of Two: The 40th Day - 2010 first week xbox 360 USA sales (5 days) - 106,293
http://www.vgchartz.com/weekly/40195/USA/
Army of Two: The Devil's Cartel - 2013 first week xbox 360 USA sales (5 days) - 38,024
http://www.vgchartz.com/weekly/41364/USA/
That is some drop!
Still funny how many shooters EA has been throwing out trying to match CoD numbers with this there 4th being there worst yet :)