During the first half of 2004, 1st BCT's two battalions (1–16th Infantry, 1–34th Armor) were augmented by the 2nd Battalion 4th Marines (2/4) and 3rd Battalion 11th Marines (3/11). When 2/4 and 3/11 left in September and October, they handed their sector of Ramadi over to the 2nd Battalion 5th Marines (2/5)2nd Battalion 11th marines were also deployed during this time to Ar Ramadi, who completed their tour in April 2005, then 1st Battalion 5th Marines (1/5) took over.