Marines with Battery K, 3rd Battalion, 11th Marine Regiment, prepare an M777A2 Howitzer to fire in the Acorn Training Area aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 2, 2016, during the regiment’s “Top Gun” competition. (Official Marine Corps photo by Cpl. Levi Schultz/Released) - Marines with Battery K, 3rd Battalion, 11th Marine Regiment, prepare an M777A2 Howitzer to fire in the Acorn Training Area aboard the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 2, 2016, during the regiment’s “Top Gun” competition. (Official Marine Corps photo by Cpl. Levi Schultz/Released)