Marine Aircraft Group 31 (MAG-31) is a United States Marine Corps aviation group based at Marine Corps Air Station Beaufort, South Carolina that is currently composed of two F/A-18C Hornet squadrons, one F/A-18A++ Hornet squadron, two F/A-18D Hornet squadrons, one F-35B Lightning II training squadron, an aviation logistics squadron, and a wing support squadron. It falls under the command of the 2nd Marine Aircraft Wing.