Direct proof of use
The GBU-38 is directly documented in the 2003 Iraq War by official U.S. military sources. The Alabama Air National Guard's 187th Fighter Wing history states that its September 2004 Operation Iraqi Freedom deployment marked the first combat use of the GBU-38 by the U.S. military and that the weapon was employed in the Battle of Fallujah.
Later daily airpower summaries show routine Iraq employment. On September 5, 2007, a B-1B Lancer dropped GBU-38s on improvised explosive devices on a road in Baqubah, and an F-16 destroyed a roadside IED with a GBU-38 in Salman Pak. On January 3, 2008, AFCENT reported F-16s using GBU-38s against a structure, enemy combatants, and a house-borne IED in Baqubah and Baghdad, while Navy F/A-18F Super Hornets used GBU-38s against enemy combatants and IED emplacers in the Baghdad area.
Sources: 187th Fighter Wing History, DVIDS Airpower Summary September 5, AFCENT Airpower Summary January 3
Timeline
The available official record places the GBU-38 in Iraq first with the 187th Fighter Wing's 2004 Operation Iraqi Freedom deployment and then in repeated airpower-summary entries during the later insurgency phase. The documented targets were mostly fixed or position-like targets, including IEDs, IED manufacturing sites, weapons caches, enemy compounds, structures, firing sites, and rocket or mortar launch positions.
By late 2007 and early 2008, the aircraft named in public summaries included U.S. Air Force B-1B and F-16 aircraft and U.S. Navy F/A-18 variants. A March 2009 DVIDS summary still reported F-16C Fighting Falcons dropping GBU-38s in Iraq against a rocket and mortar firing position used against a coalition base.
Sources: 187th Fighter Wing History, DVIDS Airpower Summary May 19, DVIDS Airpower Summary September 5, Air Force Dec. 9 Airpower Summary, Air Force Jan. 17 Airpower Summary, DVIDS Airpower Summary March 4
Operational role
In Iraq, the GBU-38 served as a 500-pound GPS/INS-guided air-to-surface weapon for fixed-coordinate precision strikes from fighter, bomber, and carrier aircraft. The Air Force fact sheet describes the JDAM family as a guidance tail kit that converts unguided bombs into adverse-weather precision munitions and lists the GBU-38 as the 500-pound Mk 82 class member.
The Iraq summaries show the munition used less as a strategic opening-war weapon and more as a tactical precision bomb for interdiction and close air support during Operation Iraqi Freedom. Reported missions included strikes on IED networks around Baghdad and Baqubah, weapons caches in Baghdad and Samarra, enemy structures in Bayji and Baqubah, and rocket or mortar firing positions threatening coalition bases.
Sources: Joint Direct Attack Munition GBU-31/32/38, DVIDS Airpower Summary November 2, Air Force Dec. 9 Airpower Summary, CENTCOM Airpower Summary December 21, DVIDS Airpower Summary March 4