fire the M777. Two soldiers from 2-319 FA were killed from a breech explosion and other members of their gun crew were injured while attempting to fire a M777 at an ISIL mortar position in northern Iraq. Multiple firing incidents have occurred during training with the M777 including a fatal one in February 2014 with 3-321 FA and previously in 2011 with Marines from Camp Lejeune also at Fort Bragg. In August 2017, two crewmen were killed and five others injured in an incident with a M777. In May 2017, the US Army revealed it was buying the Swedish Bofors 155 Bonus round as an interim system as a result of the required phasing out of cluster munitions from artillery shells, complying with policy to achieve less than 1% unexploded ordnance from non-unitary explosives. The BONUS has two sensor-fused munitions deployed by a 155 mm carrier projectile that scan the ground for targets and fire explosively formed penetrators down from the air. The system has been tested from the M777 howitzer. The 3rd Cavalry Regiment deployed multiple M777A2 guns to Firebase Saham in Iraq on the border with Syria from November 2018 to April 2019 to support the Syrian Democratic Forces in the Battle of Baghuz Fawqani, the ultimately successful operation to capture the final town held by ISIL. Marine Corps In May 2005, 3rd Battalion, 11th Marines, based at Marine Corps Air Ground Combat Center Twentynine Palms, became the first Marine unit to begin fielding the new M777. 580 guns were supplied to the Marines, and 421 to the U.S. Army and National Guard. In March 2016, 200 Marines and four M777A2 howitzers from the 26th Marine Expeditionary Unit set up Firebase Bell, officially the Karasoar Counterfire Complex, near the Iraqi town of Makhmour, supporting the Iraqi Army's Mosul offensive. The firebase was only from ISIL-controlled territory. One Marine was killed in a rocket attack on 19 March, just days after arriving. Direct attacks on the base dropped off in the following weeks as the Iraqis captured surrounding villages. The Marine howitzers fired every day in support of Iraqi maneuvers, using high explosive, smoke, and illumination rounds. They were relieved by Army soldiers after roughly 60 days, after firing more than 2,000 rounds in 486 fire missions. In March 2017, the 11th Marine Expeditionary Unit was deployed to Syria to provide artillery support with their M777s for forces seeking