Marines with 3rd Platoon, Rocket Battery F, 2nd Battalion, 14th Marine Regiment, Marine Forces Reserve, arrive at Landing Zone Bull Attack near the Chocolate Mountain Aerial Gunnery Range, California, Oct. 9, 2017 . The Marines are participating in Weapons and Tactics Instructor course 1-18 during their two-week annual training and using the High Mobility Artillery Rocket System to fire Guided Multiple Launch Rocket System rockets in a ‘sensor to shooter integration’ exercise with Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, flying the F-35B Lightning II Joint Strike Fighter. (U.S. Marine Corps photo by Lance Cpl. Melany Vasquez/ Released)