Dual-purpose improved conventional munition

A dual-purpose improved conventional munition (DPICM) is an artillery or surface-to-surface missile warhead designed to burst into submunitions at an optimum altitude and distance from the desired target for dense area coverage. The submunitions use both shaped charges for the anti-armor role, and fragmentation for the antipersonnel role, hence the nomenclature "dual-purpose". Some submunitions may be designed for delayed reaction or mobility denial (mines). The air-to-surface variety of this kind of munition is better known as a cluster bomb. They are banned by more than 100 countries under the Convention on Cluster Munitions.

An M77 DPICM of the type used by the MLRS artillery rocket launcher system. The M77 was developed from the M483A1 that was developed for so-called "cargo" artillery shells in the 155 mm and 8-inch (203 mm) calibers.

United States DPICM projectiles

Combat comparative effectiveness (Vietnam)[1]
Conventional 105 mm 155 mm 203 mm
Rounds expended 7079 3465 149
Rounds / kill 31.6 13.6 16.6
ICM 105 mm 155 mm 203 mm
Rounds expended 1121 772 153
Rounds / kill 2 1.7 0.8

Development work for DPICM projectiles began in the late 1950s. The first projectile, the 105 mm M444 entered service in 1961. Its submunitions were simple bounding anti-personnel grenades (ICM). Production of the M444 ended in the early 1990s.

The first true DPICM was the 155 mm M483, produced in the 1970s. By 1975, an improved version, the M483A1, was being used. The projectile carried 88 M42/M46 grenade-like dual purpose submunitions. The 155 mm M864 projectile entered production in 1987, and featured a base bleed that enhances the range of the projectile, although it still carries the same M42/M46 grenades.

The base bleed mechanism reduces the submunition count to 72. Work was budgeted in 2003 to retrofit the M42/M46 grenades with self-destruct fuses to reduce the problem of "dud" submunitions that do not initially explode, but may explode later upon handling. In Vietnam they were known as "firecracker rounds" owing to the rippling detonation of submunitions over a couple of seconds.

Work on 105 mm projectiles started in the late 1990s based around the M80 submunition. The eventual results were two shells, the M915 intended for use with the M119A1 light towed howitzer, and the M916 developed for the M101/M102 howitzers.

Projectile M509A1M483A1M864M915M916M444
Caliber mm 203155155105105105
Service date ?197519871998 (?)19981961
(production ended early 1990s)
Range km 5.4–23.4 ?–17 ?–3010–143–11 ?–11.5
Load 180 × M4264 × M42
24 × M46
48 × M42
24 × M46
42 × M8042 × M8018 × M39
(M444E1 used M36)
Weight projectile
(fuzed) kg
94 (approx)46.547 (approx)??14.97
Length (fuzed) mm 1115937899??371.9

Uses

DPICMs were developed for several reasons:

  • They can give a heavy, indirect-fire cannon the ability to engage area targets, with the spread compensating for their inherent inaccuracy;
  • DPICM has a potential destructive effect on armored vehicles due to the shaped charge bomblet, but it may require a very large number of shells to have an effect against targets like tank formations to the point of futility;[2]

Future

Large quantities of munitions bought during the Cold War were put into war reserve stockpiles. As of 2014, many were reaching the end of their useful life and required disposal, an expensive process. The warheads, which are now old and less stable, must be extracted. The shells are being refilled with explosives, recycling them for use as inexpensive training ammunition.[3] One such round is the M1122, built from recycled shell casings from DPICM rounds that have some explosive filling replaced with concrete. As a training round, the M1122 has one-seventh the explosive impact at one-third the cost of a standard M795 high-explosive shell.[4]

The U.S. Army is seeking a replacement of DPICMs from the Alternative Warhead Program (AWP). The AWP warheads have an equal or greater effect against materiel and personnel targets, while leaving no unexploded ordnance behind. The program is being developed by Lockheed Martin and Alliant Techsystems.[5] The first AW rockets were ordered in September 2015.[6]

On July 7, 2023, the US announced that it would supply DPICM munitions to Ukraine.[7] The weapon system could be used in both HIMARS and 155mm shell projectiles.[8][9]

President Biden justified the move by saying "the Ukrainians are running out of ammunition”. Colin H. Kahl, Under Secretary of Defense for Policy, told reporters that DPICMs were needed by Ukraine. Russian defences are making Ukraine’s offensive “hard sledding, because the Russians had six months to dig in.” Their usage also takes pressure off of US stockpiles of 155mm unitary high explosive rounds, such as those by HIMARS and the M982 Excalibur, allowing domestic production of these rounds to catch up to demand. Kahl also claimed that DPICMs can “scatter over a wide[r] area” than standard rounds, including Russian defences such as trenches. An unnamed Pentagon official put the figure of these rounds at “hundreds of thousands”. The expected fail rate is less than 2.35%. Kahl claimed that Russian cluster munitions have a fail rate of 30-40%. Ukraine has had to enter into guarantees not to use them in civilian areas and to mark areas where they have been used.[10] [11]

On 10 July, Royal United Services Institute or RUSI released a study citing the use of cluster munitions from the Vietnam War. United States Army studies from that war showed that it takes approximately 13.6 high explosive shells for each enemy soldier killed. A shell firing DPICMs relied on average only 1.7 shells to kill an enemy soldier making it eight times as effective in producing casualties as standard high explosive projectiles. In peacetime testing against vehicles, cluster munitions were 60 times as effective. RUSI used an example of a trench, a direct hit by a high explosive round will spread shrapnel "within line of sight of the point of detonation". This also reduces the wear and tear on the barrels of 155mm artillery weapons systems. [12]

On 12 July, Brigadier General Oleksandr Tarnavskyi, the commander of the Ukrainian Tavriia military sector deployed in the southern front, told CNN that they had received the cluster munitions pledged by the United States in 7 July.[13]

During the course of the Russo-Ukrainian War, objections have been raised by some NATO members which have signed the 2008 Convention on Cluster Munitions, including Germany, France and the United Kingdom. However neither Ukraine nor the USA have signed the agreement. Several other NATO member states, including Estonia, Finland, Greece, Latvia, Poland, Romania, and Turkey, are also not signatories of this agreement, nor is Russia. Human Rights Watch has reported that at least 10 types of cluster munitions are already being used on the battlefield, including munitions which were left over from USSR weapons stockpiles, and including the use of cluster munitions by Russia since 2014.[14] It is reported,[15] though officially denied, that Turkey has provided other types of cluster munitions to Ukraine in the past.[16][17]

On 14 August Ukrainian forces released drone footage from Urozhaine, in Donetsk Oblast. The two videos appear to show the remaining Russian forces in the town retreating under fire, as the Ukrainians deploy DPICMs in their path. Forbes writer David Axe has described the resulting scene as "murder" and a "bloodbath", given that Ukrainian artillery spotters were afforded an unobstructed view of the Russian retreat in the clear light of day, and the retreating Russian infantrymen were completely unsupported by tanks or other vehicles. Regarding this lack of support and the outcome of the poorly-executed Russian retreat, Axe cites Russian military bloggers who blame the carnage on “the 37th Motor Rifle Brigade for failing to send tanks to support the infantry”, as well as “brigade troopers [who] were drunk”.[18]

References

  1. The Evolution of Artillery for Increased Effectiveness (PDF), Picatinny Arsenal, RDECOM, June 2008
  2. Dullum, Ove (2008). Cluster weapons – military utility and alternatives. Norwegian Defence Research Establishment. pp. 35–36. ISBN 978-82-464-1318-1.
  3. "Recycling Cold War Super Shells". Strategypage.com. January 25, 2013.
  4. Groundbreaking round: New artillery round brings promise of more bang, less buck - Marines.mil, 30 November 2015
  5. "US Army searches for cluster munitions alternatives". Dmilt.com. 6 June 2013.
  6. "Lockheed Martin GMLRS Alternative Warhead Gets First Order". Marketwatch.com. 15 September 2015.
  7. "US to send cluster munitions because Ukrainian counteroffensive 'going slower than hoped'". The Guardian. 7 July 2023. Retrieved 7 July 2023.
  8. Bertrand, Natasha (29 June 2023). "Biden administration could soon approve sending controversial cluster munitions to Ukraine". CNN.
  9. WARD, ALEXANDER (29 June 2023). "U.S. actively considering giving cluster munitions to Ukraine". politico.
  10. ALTMAN, HOWARD (7 July 2023). "Ukraine Situation Report: U.S. Sending 'Hundreds Of Thousands' Of Cluster Munitions". the drive.
  11. Smith, David (8 July 2023). "End justifies means for Biden in sending cluster bombs to Ukraine". The Guardian.
  12. Dr Jack Watling; Professor Justin Bronk (10 July 2023). "Giving Ukraine Cluster Munitions is Necessary, Legal and Morally Justified". Royal United Services Institute.
  13. "Commander: Ukraine receives cluster munitions from US". The Kyiv Independent. 13 July 2023. Retrieved 13 July 2023.
  14. "Cluster Munition Use in Russia-Ukraine War". 29 May 2023.
  15. Rogin, Josh (2023-03-02). "Opinion | Ukrainians are begging for cluster munitions to stop the Russians". Washington Post. ISSN 0190-8286. Retrieved 2023-07-17.
  16. "What are the cluster munitions the US is expected to supply Ukraine and why are they so controversial?". CNN. 7 July 2023.
  17. ARMY AMMUNITION DATA SHEETS ARTILLERY AMMUNITION FOR GUNS, HOWITZERS, MORTARS, RECOILLESS RIFLES, AND 40MM GRENADE LAUNCHERS (FEDERAL SUPPLY CLASS 1310, 1315, 1320, 1390) (PDF) (Technical Manual). United States Army Publishing Directorate. 28 April 1994.
  18. "Ukrainian Cluster Shells Massacred Russian Troops Fleeing Urozhaine". Forbes. 14 August 2023. Retrieved 13 July 2023.
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