Marines with 1st Battalion, 10th Marine Regiment participate in a section chief course learn to use every position in operating a howitzer aboard Camp Lejeune, N.C., May 18 – June 5. The howitzer is a towed 155 mm artillery piece that requires a minimum of five gun crewmembers to operate. During the course, students become familiarized with every aspect of the weapons system. - Marines with 1st Battalion, 10th Marine Regiment participate in a section chief course learn to use every position in operating a howitzer aboard Camp Lejeune, N.C., May 18 – June 5. The howitzer is a towed 155 mm artillery piece that requires a minimum of five gun crewmembers to operate. During the course, students become familiarized with every aspect of the weapons system.