U.S. Marine Corps Lance Cpl. Trevor Serenelli, an aviation

U.S. Marine Corps Lance Cpl. Trevor Serenelli, an aviation ordnance technician with Marine Fighter Attack Squadron (VMFA) 122, works on an M61A2 20mm Vulcan cannon during Exercise Pitch Black 2016 at Royal Australian Air Force Base, Australia, Aug. 5, 2016. The lightweight gun is used only in F/A-18s and the six rotating barrels minimize barrel erosion and heat generation, contributing to a long weapon life. Shooting 6,000 rounds per minute, the gun will replace a cannon in one of the squadron’s F/A-18C Hornets and will be used for ground targets during Pitch Black. The exercise affords Marines with VMFA-122 the opportunity to integrate and increase interoperability with regional joint and coalition partners while developing operational concepts for conducting sustained combat operations. (U.S. Marine Corps photo by Cpl. Nicole Zurbrugg)