The M142 HIMARS (High Mobility Artillery Rocket System) is multiple rocket launcher system mounted to a 6x6 FMTV truck chassis. HIMARS was developed by Lockheed Martin Missiles and Fire Control under an advanced concept technology demonstration (ACTD) programme, placed in 1996. The purpose of HIMARS is to engage and defeat artillery, air defence concentrations, trucks, light armour and personnel carriers, as well as support troop and supply concentrations. HIMARS is able to launch its weapons and move away from the area at high speed before enemy forces are able to locate the launch site. Offering Multiple Launch Rocket System (MLRS) firepower on a wheeled chassis, the High Mobility Artillery Rocket System (HIMARS) is the newest member of the MLRS launcher family. HIMARS carries a single six-pack of rockets or one ATACMS missile on the Army's new Family of Medium Tactical Vehicles (FMTV) 5-ton truck, and can launch the entire MLRS family of munitions. HIMARS is operated by a crew of three - driver, gunner and section chief - but the computer-based fire control system enables a crew of two or even a single soldier to load and unload the system. HIMARS received approval to enter production in March 2003 and is currently in Full Rate Production. HIMARS successfully completed initial operational test and evaluation in November 2004. In May 2005, the 3rd Battalion, 27th Field Artillery Regiment, XVIII Airborne Corps Artillery was the first unit equipped with HIMARS. HIMARS has been a joint system since 2000 when the U.S. Marine Corps joined the program. It was successfully combat-tested in Operation Iraqi Freedom.

No variants at this time.