Encyclopedia Astronautica

Land Attack Standard Missile, a derivative of the Standard Missile SM-2MR naval air-defense designed to provide surface-to-surface fire support for the US Marine Corps.

Three prototypes were test fired in 1997, and it was planned to put up to 800 converted missiles in US Navy weapon launchers. But the project was cancelled in 2002

Maximum range: 280 km (170 mi).

Historical Essay © Andreas Parsch

Raytheon RGM-165 LASM

The LASM (Land Attack Standard Missile), sometimes also referred to as SM-4 (Standard Missile 4), is a derivative of the RIM-66 Standard SM-2MR air-defense missile. It is intended to provide long-range ship-based high-precision fire support for U.S. Marine Corps ground forces. The LASM's main targets will be missile sites, artillery, and logistics assets.

The LASM replaces the radar seeker and MK 115 warhead of the SM-2MR Block II-III with GPS-INS guidance and the MK 125 warhead (used by the SM-2MR Block III A) in a new low-drag nose. The MK 104 rocket motor, as well as the control section and flying surfaces, will be retained, ensuring that the missile can be used with existing SM-2MR launchers. The LASM attacks its target with a near vertical approach angle, and the blast-fragmentation warhead is triggered above ground for maximum effect.

After a concept demonstration of the new guidance system and warhead in late 1997, using three modified RIM-66K SM-2MR Block III missiles, development of the proper LASM began, and the designation RGM-165A was allocated. It was originally planned to convert up to 800 existing SM-2MR Block II-III missiles to RGM-165A configuration, with IOC (Initial Operational Capability) planned for 2003 or 2004. However, the LASM program has been suspended by the Navy in 2002, and will most probably be cancelled.


Note: Data given by several sources show slight variations. Figures given below may therefore be inaccurate!

Data for RGM-165A:

Length 4.72 m (15 ft 6 in)
Finspan 1.07 m (42.3 in)
Diameter 0.34 m (13.5 in)
Weight 620 kg (1370 lb)
Speed Mach 3.5
Range 280 km (150 nm)
Propulsion Thiokol MK 104 dual-thrust solid-fueled rocket
Warhead 135 kg (300 lb) MK 125 blast-fragmentation
Main Sources

[1] Norman Friedman: "World Naval Weapons Systems, 1997-98", Naval Institute Press, 1997
[2] "Vision... Presence... Power, A Program Guide to The U.S. Navy", 2000 Edition
[3] Hajime Ozu: "Missile 2000 - Reference Guide to World Missile Systems", Shinkigensha, 2000

AKA: RGM-165.
Status: Cancelled 2002.

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Associated Countries
See also
  • missile Guided self-propelled military weapon (as opposed to rocket, an unguided self-propelled weapon). More...

Associated Manufacturers and Agencies
  • Raytheon American manufacturer of rockets and spacecraft. Raytheon, USA. More...

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