In March 2008, under the command of LTC Matt Elledge, the 1st Battalion, 22nd Infantry deployed with the 1st Brigade Combat Team, 4th Infantry Division to Iraq for a third time to conduct operations in the Baghdad area. In March 2009, the battalion returned to Fort Hood, Texas having restored civil order in southwestern Baghdad. Upon returning home from Iraq, the battalion was awarded the Valorous Unit Award for displaying "extraordinary heroism in action against an armed enemy in support of Operation Iraqi Freedom" and "the unit demonstrated the ability to innovate and accomplish the mission beyond the call of duty".
Soldiers who did not return home: CPT Andrew "Drew" Pearson (HHC Commander) (died 30 April 2008), SPC Ronald Tucker (died 30 April 2008), and CPL Steven Thompson (died 14 February 2009). In the summer of 2009, the battalion moved with the 4th Infantry Division to Fort Carson, Colorado to prepare for future operations.