Direct proof of use
The LUU-2 illuminating flare is documented in the 2003 Iraq War through official U.S. government sources. A 2012 Department of Justice settlement release says ATK delivered LUU-2 and LUU-19 illuminating para-flares to the Department of Defense from 2000 to 2006 and that the flares were used extensively by American forces in Iraq and Afghanistan.
A U.S. Navy photo record from May 8, 2005, gives a conflict-specific operational setting: aboard USS Carl Vinson in the Persian Gulf, an aviation ordnanceman prepared LUU-2B/B flares for attachment to F/A-18C Hornets while the carrier strike group was conducting operations in support of multinational forces in Iraq.
Sources: ATK Launch Systems Settlement, US Navy LUU-2B/B flares for F/A-18C Hornets
Timeline
The documented Iraq War evidence begins with the 2000-2006 procurement and delivery window described in the DOJ release, which ties LUU-2 and LUU-19 para-flares to American combat operations in Iraq and Afghanistan.
On May 8, 2005, the Navy photo record places LUU-2B/B flares on USS Carl Vinson in the Persian Gulf for F/A-18C Hornet operations connected to multinational forces in Iraq. The record supports theater fielding and preparation for aircraft use; it does not identify a specific flare drop or target.
Sources: ATK Launch Systems Settlement, US Navy LUU-2B/B flares for F/A-18C Hornets
Narrative
In Iraq War service, the LUU-2 family functioned as an aircraft-delivered illumination store rather than as a strike munition. The same DOJ release describes LUU-2 and LUU-19 para-flares as nighttime combat, covert-operations, and search-and-rescue equipment, while Air Force manual material describes LUU-2/B and LUU-2A/B flares as air-launched parachute flares with roughly five minutes of visible illumination.
The available public evidence supports U.S. use and fielding in the Iraq theater, especially for aviation night-illumination tasks. It does not, by itself, identify a named Iraqi location illuminated by LUU-2 flares, a particular aircraft sortie, or a confirmed casualty or battle-damage outcome.
Sources: ATK Launch Systems Settlement, US Navy LUU-2B/B flares for F/A-18C Hornets, AFMAN 11-2MC-130Jv3