Sgt. 1st Class John Archon, a Multiple Launch Rocket System Crewmember (13M) with 3-116th Field Artillery Battalion explains the duties of a 13M Military Occupational Specialty (MOS). The High Mobility Artillery Rocket System (HIMARS) is a U.S. Army rocket artillery system that is mounted on a wheeled chassis and can launch a variety of missiles and rockets, including the Guided Multiple Launch Rocket System (GMLRS). In order to become a HIMARS Crewmember, Soldiers must attend four weeks of Advanced Individual Training (AIT) program after 10 weeks of Basic Combat Training. (Video by Sgt Pedro A Arroyo)