Direct proof of use
Oryx documented Islamic State imagery from March 2016 showing truck-mounted 122 mm D-30 howitzers operated by the Al-Farouq Platoon of the Wilayat Ninawa Air Defence Battalion. The guns were photographed in and around Mosul firing at U.S. Navy EP-3 signals-intelligence aircraft.
The documented use was not conventional ground fire support. Islamic State forces mounted the howitzers on captured trucks and used them as improvised anti-aircraft artillery, apparently relying on a direct hit against slow-flying surveillance aircraft rather than a purpose-built air-defense fuze or missile system.
Sources: Oryx Islamic State D-30 Anti-Aircraft Use
Timeline
ISIS captured Mosul in June 2014, giving the group a major urban base and access to large quantities of Iraqi military equipment. Oryx later assessed that the D-30 guns used in the Mosul anti-aircraft role likely came from Syria, where Islamic State forces had captured dozens of D-30s from 2014 onward, while the truck chassis included vehicles captured after Mosul fell.
By March 2016, Islamic State media showed the Mosul-based truck-mounted D-30s firing at U.S. Navy EP-3 aircraft. Iraqi forces, backed by the coalition, liberated Mosul in July 2017.
Sources: Long War Journal Mosul Capture, Oryx Islamic State D-30 Anti-Aircraft Use, DoD Mosul Liberation
Narrative
The D-30's Islamic State use in the campaign was a field expedient adaptation. Oryx identified U.S.-made Navistar International 7000 Series trucks and M936 wreckers modified to carry Soviet-legacy 122 mm D-30 howitzers, including a vehicle apparently housed in a hardened aircraft shelter at Mosul airport and moved outside when a target appeared.
The incident illustrates the difference between possession, adaptation, and effective air defense. Oryx described the D-30 as a conventional artillery weapon normally used against ground targets; in the Mosul imagery it was fired upward at coalition surveillance aircraft, but no aircraft loss or damage was reported in the source.
Sources: Oryx Islamic State D-30 Anti-Aircraft Use