Mk 153 Shoulder-Launched Multipurpose Assault Weapon. The Mk 153 Shoulder-Launched Multipurpose Assault Weapon (SMAW) is a smoothbore shoulder-fired rocket launcher. It is a portable assault weapon (i.e., bunker buster) and has a secondary anti-armor ability. Developed from the B-300, it was introduced to the United States Armed Forces in 1984. Compared to the Israel Military Industries' (IMI Systems) B-300, the American-redesigned SMAW launcher shares similar external characteristics but differs mainly in its use of a 9x51mm spotting rifle, similar to that of the LAW 80. In fact, the SMAW's spotting rifle and cartridges are an evolution of those created for the LAW 80. This spotting rifle provides the advantage of simplified target acquisition and an improved probability of a successful hit.

The SMAW's main purpose is to destroy bunkers, buildings, and light armored vehicles, during assault operations, using high-explosive dual mode (HEDM) rockets. The SMAW can also engage armored vehicles using high-explosive anti-armor (HEAA) rockets, which has a maximum effective range of  against a tank-sized target. Operations in Iraq also saw use of the SMAW-NE (Novel Explosive) rocket, a thermobaric rocket used to collapse buildings and cave openings. Within the U.S. Marine Corps, the SMAW was typically operated by Assaultmen and Combat Engineers. Each rifle company had an assault section that consisted of 13 Marines and six SMAW rocket launchers. Led by a section leader, the section was divided into three assault squads, each consisting of four Marines. Each squad was further split into two teams of two Marines, with each team equipped with one SMAW rocket launcher.

Service history
Serial production for the SMAW began in 1983, with deliveries starting in February 1984. By the time deliveries under the initial contract were completed in 1987, the U.S. licensee had delivered 1,828 Mk 153 launchers to the U.S. Marine Corps. The SMAW has since seen service with the U.S. Marine Corps in conflicts such as Operation Just Cause, the Gulf War, the War in Afghanistan, and the Iraq War.

During Operation Just Cause in Panama (1989), the U.S. Army recognized the need for a lightweight weapon capable of defeating bunkers, fortifications, and other fortified defensive structures. Despite this, the Army did not have a suitable weapon at the time. As a result, during Operation Desert Storm (1991), the Army had to borrow 125 Mk 153 Shoulder-Launched Multipurpose Assault Weapons (SMAW) from the U.S. Marine Corps. It became clear that the weapon, while effective, was too heavy and long for use by paratroopers. But, the Army's standard M136 AT4 also proved unsuitable for bunker-busting. In response, the Army initiated the Multi-Purpose Individual Munition (MPIM) program in September 1991. This eventually lead to the adoption of the M141 BDM, a single-shot, disposable version of the Mk 153 SMAW using the same HEDM rocket.

In the early-2000s, the Mk 153 Mod 0 SMAW had a series of modifications to address several of its shortcomings. These modifications included a resleeving process for bubbled launch tubes, rewriting/drafting operator and technical manuals, a kit that will reduce environmental intrusion into the trigger mechanism, and an optical sight modification to allow the HEAA rocket to be used effectively against moving armor targets. Boresight bracket kits were also fielded that solved the loss of boresight problem between the launch tube and the spotting rifle. 

The Mk 153 SMAW has proven to be a vital asset in urban warfare, particularly during the Iraq War. In Iraq, it was extensively used in the Second Battle of Fallujah, where it demonstrated its effectiveness in destroying enemy-held buildings. Marines employed the SMAW Novel Explosive (SMAW-NE) thermobaric rocket to collapse structures and neutralize fortified positions. For instance, a single Marine reportedly leveled 12 buildings with 14 rounds in one day. The SMAW's destructive capability significantly enhanced small-unit firepower, allowing infantry to engage entrenched enemies without relying solely on larger, less maneuverable systems like tanks. However, the SMAW-NE round lacked sufficient penetrating power for some walls in Fallujah, so Marines often used High-Explosive Dual-Mode (HEDM) rockets to create a hole in the wall or building, then fire an NE round that would level the structure. Despite occasional difficulties in wall breaching, the weapon proved to be an indispensable tool in urban assault operations.In 2023, Ukrainian forces, including the 68th Jager Brigade, used the Mk 153 SMAW in operations and training to combat Russian forces. Documented deployments showed the weapon's role in urban combat and targeting fortified positions.

Improvement Programs

Follow-On To SMAW
In 2002, the corps began a program to develop a successor to the SMAW system, tentatively titled "Follow-On To SMAW". The contract was awarded to Lockheed Martin and Israel Military Industries (IMI); this resulted in the enhanced FGM-172 SRAW. In combat operations, it was ultimately used to augment, rather than replace, the SMAW system.

SMAW II program
In 2008, a replacement program was again initiated and titled the SMAW II. It was developed in tandem with a round capable of being fired from an enclosed area without ill effects on the environment and personnel. Its combined weight is  —  for the launcher,  for the rocket. The contract was worth up to .

SMAW II Serpent

In 2012, Raytheon Missile Systems developed a SMAW II launcher named Serpent, and Nammo Talley developed new rounds for the Serpent. The Serpent is similar in many respects to the first SMAW launcher, except that it replaces the standard SMAW launcher's spotting gun with more sophisticated fire control electronics. The sighting unit on the launcher is enclosed in a unique protective cage, which is also a carry handle. The development reduced the over-all weight by  from the older SMAW launcher. The Serpent fires the same rounds as the standard SMAW and supports new and improved/enhanced rounds. But, the Serpent was never adopted for service, instead the USMC eventually adopted the Mk 153 Mod 2 to replace the service's SMAW launchers by 2020.

Variants

Mk 153 Mod 0 
The Mk 153 Mod 0 SMAW fires  rockets through an  diameter launch tube. The system can fire a variety of encased rockets, such as the Mk 3 Mod 0 High-Explosive Dual Mode (HEDM) Rocket, the Mk 6 Mod 0 High-Explosive Anti-Armor (HEAA) Rocket, the Mk 7 Mod 0 Common Practice Rocket, and the Mk 80 Mod 0 Novel Explosive (NE) Rocket. The rocket encasements are loaded into the rear of the launcher, and the launch tube is constructed from a durable fiberglass-epoxy composite material with a gel coated bore.

The launcher consists of the launch tube, spotting rifle, electro-mechanical firing mechanism, mounting brackets, open battle sights and an optic mount for the Mk 42 Mod 0 day sight, RCO, AN/PVS-4 or AN/PVS-17C night sights. The system can also be aimed at night with an infrared aiming laser from the AN/PEQ-15 or AN/PEQ-16 in conjunction with night vision, since the IR laser is attached to the optic mount that can change elevation based on the range it is set to. The firing mechanism mechanically fires the spotting rifle and uses a magneto to fire the rocket. 

The spotting rifle is mounted on the right side of the launch tube and operates semi-automatically through primer actuation. When fired, the primer sets back, unlocking the breech and ejecting the spent round. The mounting brackets secure the spotting rifle to the launcher and allow for precise alignment adjustments to ensure the spotting rifle is properly aligned with the launch tube.

The 9×51mm Mk 217 Mod 0 spotting round is ballistically matched with the rocket, improving the gunner’s first-round hit probability. Spotting cartridges are stored in a six-round magazine located in the cap of the encased rocket. Each spotting round features a special 9mm projectile containing a tracer compound, which is crimped into a 7.62×51mm NATO casing, with a .22 Hornet primer.

Mk 153 Mod 1 

The Department of the Navy filed a patent application on October 30, 1995, for a design named "Shoulder-launched multiple-purpose assault weapon" that featured a rearrangement of the spotting rifle underneath the launch tube, with the patent officially granted and published on January 27, 1998. While it is unclear if this patent officially corresponds to the Mk 153 Mod 1, this reference includes a picture of the same design, labeled "Mk 153 Mod 1 Launcher."

The rearranged spotting rifle was intended to make the weapon system more balanced and address accessibility issues found with the Mod 0, where the spotting rifle was mounted on the right side. This redesign aimed to streamline operations by centralizing the weapon's controls and improving the gunner's ability to reload the spotting rifle independently. It was claimed to offer improved reliability while also reducing the number of parts for easier maintenance, as well as reducing weight. There is no evidence the Mk 153 Mod 1 was ever adopted for service.

Mk 153 Mod 2 
The Mk 153 Mod 2 is an enhanced variant, featuring an electronic modular ballistic sight (MBS) in place of the 9 mm spotting system. The MBS system consists of the AN/PSQ-23A laser rangefinder and the AN/PAS-13G Light Weapon Thermal Sight (LWTS). To engage a target, the gunner first acquires the target using the thermal sight (AN/PAS-13G), which allows them to see the target in various environmental conditions. Once the target is acquired, the gunner depresses a button on the front grip to activate the laser rangefinder (AN/PSQ-23A). The rangefinder emits a laser pulse to measure the range to the target. This range data is then sent to the thermal sight, which processes the information and adjusts the reticle, displaying a chevron symbol that indicates the correct point of aim based on the range, external temperature, and selected rocket type. The gunner then aligns the chevron with the target and fires. The Mod 2 also has a reduced weight of  with the MBS attached, along with other improvements, like increased pad size on the forward grip and foldable backup iron sights. The Mk 153 Mod 2 reached full operational capability (FOC) across the United States Marine Corps between 2019 and 2020.

Rockets 

 The Mk 3 Mod 0 Encased High-Explosive, Dual Mode (HEDM) rocket is effective against bunkers, masonry, concrete walls and light armor. It uses the Mk 420 Mod 0, a deceleration-based fuze located at the rear of the warhead, to automatically distinguish between soft targets (low deceleration) and hard targets (high deceleration). For hard targets, such as reinforced concrete walls or armored vehicles, the aluminum warhead casing mushrooms upon impact, increasing the contact surface area between the warhead and the target to maximize blast effects. For soft targets, the rocket employs a delayed detonation, enabling deeper penetration into structures like sandbag bunkers or buildings to maximize internal damage. The warhead is filled with Composition A-3, enhanced with powdered aluminum to increase the explosive’s energy output and overall destructive power. The HEDM round can penetrate  of double-reinforced concrete walls,  of brick, up to  of rolled homogenous armor, or up to  of wood-reinforced sandbags. It is sometimes referred to as "High-Explosive Dual Purpose (HEDP)", instead of HEDM, in some manuals, but in those manuals it still describes it as having 2 modes, a "fast" and "slow" mode, and it clearly states "Dual Mode" on the rocket encasement and the rocket itself (as seen in the picture below).
 The Mk 7 Mod 0 Encased, Common Practice rocket is used in training. The warhead consists of a blue plastic projectile attached to a rocket motor similar to the HEDM rocket. The rocket contains no explosive. It does not damage a target except by kinetic energy. On impact, the plastic warhead ruptures, dispensing an inert white spotting powder.
 The Mk 6 Mod 0 Encased High-Explosive, Anti-Armor (HEAA) rocket is effective against current tanks without added armor, and uses a standoff rod on the detonator, allowing the explosive force to be focused on a small point and for maximum damage against targets. The HEAA round can penetrate up to the equivalent of  of rolled homogeneous armor. The unit cost of the Mk 6 HEAA round is $25,000.
 The Mk 80 Mod 0 Encased Novel Explosive (SMAW-NE) rocket is effective against caves, buildings, and bunkers. The SMAW-NE has an enhanced-blast warhead with a  charge of PBXN-113 and a slightly modified version of the dual mode fuze used by the HEDM rocket, the Mk 420 Mod 1. The Indian Head Naval Surface Warfare Center teamed with Marine Corps Systems Command and Talley Defense Systems to respond to an urgent U.S. Marine Corps need for a shoulder-launched enhanced-blast warhead in 2003. It was used in combat during both the first and second offensives in Fallujah, in 2004.

Backblast Area 
As with all of these types of recoilless rocket weapons, the backblast that is created when it is fired is a primary safety concern. When the rocket is fired, the rocket propellant is expended entirely within the rocket encasement. This is the cause of the extremely loud and violent backblast. This backblast extends in a 90-meter, 60° cone to the rear of the weapon. The backblast is lethal out to  and still extremely dangerous to . An assistant gunner is often used during employment of the weapon system to monitor the backblast area and clear it of fellow troops, or to notify the gunner of obstructions that could reflect the force of the backblast back at the gun team. The gunner is only cleared to launch a rocket when he hears the command "Backblast area secure" from his assistant gunner.

Users

Current operators
 : Armed Forces of Ukraine
 :
United States Army: Borrowed from and returned to the Marine Corps
United States Marine Corps

See also
 List of rocket launchers
 List of anti-tank missiles
 B-300
 Carl Gustaf 8.4cm recoilless rifle
 Breda Folgore
 LRAC F1
 M141 Bunker Defeat Munition (SMAW-D)
 M79 Osa
 Kestrel (rocket launcher)

References

External links

 SMAW – Global Security
 SMAW at FAS
 United States Marine Corps Introduction to Crew Served Weapons
 U.S. Marine Corps Technical Manual Operator's Manual TM 08673A-10-1B - 83mm SMAW MK | PDF | Projectile Weapons | Firearms

Anti-tank rockets of the United States
United States Marine Corps equipment
Weapons of the Republic of China
Thermobaric weapons
Military equipment introduced in the 1980s