Sgt. Jansen Davis, a section chief with 3rd Platoon, Rocket Battery F, 2nd Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, guides a Guided Multiple Launch Rocket System onto an M142 High Mobility Artillery Rocket System during Weapons and Tactics Instructor course 1-18 at Landing Zone Bull Attack, near the Chocolate Mountain Aerial Gunnery Range, California, Oct.11, 2017. The Marines are participating in WTI 1-18 during their two-week annual training to advance their combat effectiveness and readiness for future exercises and deployment. (U.S. Marine Corps photo by Lance Cpl. Melany Vasquez/ Released)