F-35B Lightning II aircraft, belonging to Marine Fighter Attack Squadron 121, Marine Aircraft Group 12, arrived at Marine Corps Air Station Iwakuni January 12, beginning the squadron’s permanent basing at the air station. - F-35B Lightning II aircraft, belonging to Marine Fighter Attack Squadron 121, Marine Aircraft Group 12, arrived at Marine Corps Air Station Iwakuni January 18, beginning the squadron’s permanent basing at the air station.