Direct proof of use
The M203 40 mm grenade launcher was used by U.S. forces during the 2003 Iraq War. DVIDS reporting on a March 2005 convoy ambush described a Kentucky National Guard military police soldier returning fire with M203 grenade-launcher rounds while the unit fought insurgents after an RPG hit the lead vehicle.
Additional DVIDS accounts documented M203 use during dismounted and urban engagements. In north Babil in April 2005, a U.S. Army corporal used an M4 carbine and M203 grenade launcher to lay down suppressive fire during an ambush near the CiCi Bar Canal; in Baghdad's Adhamiyah district in June 2007, a U.S. Army sergeant used an M203 to keep insurgents behind cover while another soldier prepared an AT4 shot.
Sources: DVIDS Kentucky Guard Ambush, DVIDS North Babil Patrol, DVIDS Adhamiyah Firefight
Timeline
The sourced record places M203 use across several phases of the war. Combat accounts from 2005 and 2007 describe the launcher used for suppressive and protective fire during patrol and convoy actions, while 2008 reporting described a platoon being ordered to employ M203 grenade launchers and an Mk 19 automatic grenade launcher after enemy fighters fired RPGs near Jisr Diyala.
Later in the war, public U.S. military sources documented the M203 in training and advise-and-assist contexts. A 2009 DVIDS image showed a U.S. Army civil-affairs soldier firing an M203 at Normandy Range Complex in Basra, and a 2011 Army article reported soldiers in Baghdad training with M203 non-lethal rounds for advise-and-assist missions with Iraqi security forces.
Sources: DVIDS Jisr Diyala Ambush, DVIDS Basra M203 range training, Army Non-Lethal Ammo Training
Operational role
In the Iraq record, the M203 appears as a squad-level 40 mm launcher carried by U.S. soldiers on patrols, convoy-security missions, and mounted or dismounted operations. The cited incidents show it used primarily for suppressive fire, force protection, and close fire support rather than as an anti-armor weapon.
The same sources separate operational use from training. The 2005-2008 accounts describe M203 fire during engagements with insurgents, while the Basra and Baghdad training reports show the launcher remaining in theater for qualification, range work, and non-lethal munition preparation as U.S. units moved into advise-and-assist missions.
Sources: DVIDS Kentucky Guard Ambush, DVIDS North Babil Patrol, DVIDS Adhamiyah Firefight, DVIDS Jisr Diyala Ambush, DVIDS Basra M203 range training, Army Non-Lethal Ammo Training
