Direct proof of use
The GBU-32 1,000-pound Joint Direct Attack Munition is directly documented in the 2003 Iraq War through U.S. air-war munitions data reproduced by Human Rights Watch. In Appendix D of Off Target, Human Rights Watch listed 768 GBU-32 JDAMs among the precision-guided munitions used in the Iraq air campaign.
The same appendix places the GBU-32 inside the broader U.S. and coalition air campaign that used 19,040 precision-guided munitions in the 2003 fighting. The source supports use of the weapon type in the campaign, but it does not identify every GBU-32 release platform, target, or strike location.
Sources: HRW Off Target Iraq JDAM Table, HRW Off Target Iraq Report
Air-campaign context
The 2003 Iraq air campaign began on March 20, 2003, and shifted from initial leadership and air-defense attacks to wider strikes supporting coalition ground operations. Air & Space Forces Magazine summarized Lt. Gen. T. Michael Moseley's Operation Iraqi Freedom--By the Numbers report as covering March 19 through April 18, 2003, with 41,404 coalition sorties and 29,199 total bombs, rockets, and missiles.
Within that munitions mix, JDAM was one of the main precision-guided weapon families. The Air Force and Navy describe JDAM as a GPS/INS guidance tail kit that converts existing free-fall bomb bodies into all-weather guided munitions; the 1,000-pound class corresponds to the GBU-32 family.
Sources: Air Force Magazine OIF Air Campaign Numbers, Air Force JDAM Fact Sheet, Navy JDAM Fact File
Later Iraq use
Public Navy historical material also records later Iraq-conflict use after the initial 2003 campaign. The Naval History and Heritage Command history of USS John F. Kennedy states that on July 20, 2004, Carrier Air Wing Seventeen aircraft destroyed two anti-Iraqi positions, with an F/A-18C Hornet dropping GBU-32 guided bombs on the positions.
That 2004 entry is a separate post-invasion Iraq use record and should not be read as part of the 768-bomb total from the March-April 2003 air campaign.
Sources: NHHC John F. Kennedy History