Ground Launched Small Diameter Bomb

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Ground Launched Small Diameter Bomb
M270 MLRS
  • M142 HIMARS
  • Or can be launched from its own launch container
  • ReferencesJanes[7][8]

    The Ground Launched Small Diameter Bomb (GLSDB) is a weapon developed by

    M26 rocket, enabling it to be launched from ground-based missile systems such as the M270 Multiple Launch Rocket System and M142 HIMARS.[9][10]

    The weapon started initial mass production in 2023 and saw its first combat deployment by Ukraine in 2024 during the Russian invasion of the country. The performance was reportedly disappointing due to Russia's electromagnetic warfare capabilities, along with deficiencies in tactics, techniques, and procedures.

    Design

    Boeing, in partnership with Saab, developed an "inter-stage adapter" to connect the SDB to an

    GMLRS, depending on the type[16] (16 kg (35 lb)[21] vs 23 kg (51 lb)[22]). While typical rockets from multiple launch rocket systems (MLRS) follow a ballistic trajectory, the rocket-launched SDB can be launched to altitude and glide on a selected trajectory.[23][11] Twelve M26 rockets at a time can be launched from MLRS, six at a time from HIMARS.[24]

    Boeing and Saab Group conducted three successful GLSDB tests in February 2015. Unlike traditional artillery weapons, the GLSDB offers 360-degree coverage for high and low angles of attack, flying around terrain to hit targets on the back of mountains, or circling back around to a target behind the launch vehicle. The GLSDB has a range of 150 km (93 mi), or can hit targets 70 km (43 mi) behind the launch vehicle.[25][26] The weapon can be set to detonate above the ground or with a delay for deep penetration.[12]

    In a 2017 demonstration, the GLSDB engaged a moving target at a distance of 100 km (62 mi). The SDB and rocket motor separated at altitude and the bomb used a semi-active laser (SAL) seeker to track and engage the target.[27] The laser-guided SDB had previously been tested successfully using targets travelling at 50 miles per hour (80 km/h).[28]

    The cost is undisclosed; however the SDB used in GLSDB has a cost to the U.S. military of about $40,000,

    ATACMS missiles,[34][35] which have a price per unit estimated to be well over $1 million.[36] The other long distance alternative is the 250 km (160 mi) Storm Shadow missiles,[37] each of which is estimated to cost around £2 million ($2.5 million,[38] fiscal year 2023). The U.K. has agreed to supply these to Ukraine.[39] The purpose in developing the weapons was to offer poorer countries the strike capacity of more expensive and advanced air forces.[24]

    Unlike conventional artillery that follows a predictable path from launch to destination, the wings and navigation ability of the GLSDB allow it to evade obstacles and anti-air defenses by steering around them, even approaching from the target’s rear.[40][11] Also, because the GLSDB is a glider it has little IR signature, making it a poor target for IR homing missiles such as MANPADS.[41]

    Use in combat

    On 3 February 2023, the United States government announced an aid package for Ukraine as part of assistance during the

    2022 Russian invasion of Ukraine that would include the GLSDB, which could be launched out of existing Ukraine-operated HIMARS or MLRS launchers (or out of its own launcher) to hit Russian targets that had been moved out of GMLRS range. The GLSDB almost doubles the range that Ukraine could previously target with these launchers (150 km (93 mi) vs 85 km (53 mi) with GMLRS).[42][17]

    The weapon entered "initial mass production stage" in 2023.[43] On 30 January 2024, Politico reported that the missiles could be deployed as soon as the following day.[44] On 14 February 2024, Russian media published footage on what looks to be a GLSDB tail wreckage, reportedly found near Kreminna, Luhansk Oblast.[45][46] On 26 March 2024, a GLSDB was used to strike a house, in Chernyanka, Kherson, where Russian UAV operators were based.[47] Ukrainian forces also destroyed a Russia 2S9 Nona 120 mm mortar and the “burning” of another in Zaporizhzhia.[48]

    In April 2024, a U.S. defense official remarked that the combat performance had been disappointing: due to Russian jamming and deficiencies in tactics, techniques, and procedures "it just didn't work". The War Zone wasn't certain that this was weapon system referred to.

    APKWS II or another undisclosed weapon system. The Under Secretary also noted that the production and testing of the weapon was "raced and (they) did it as fast as they could". He also referred to multiple reasons, including tactics, doctrine and "electromagnetic interference" as being issues.[49]

    Operators

    Current operators

    Potential operators

    References

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