Annex D
Annex D
ANNEX D
                                                                                                                                Cover image: Russian Tank T-90MS-V firing its main gun (Photo credit: photobucket bhenkz2)
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Characterisation of explosive weapons study, annex D  115 mm, 120 mm & 125 mm tank guns
GICHD, Geneva, February 2017
ISBN: 978-2-940369-65-2
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     CONTENTS
INTRODUCTION 4
TANK GUNS 6
Brief Descriptions 11
CASE STUDIES 13
                Case Study 1	                              13
                Case Study 2	                              17
                Case Study 3	                              21
                Case Study 4	                              24
                Case Study 5	                              26
Annex D                                               Contents   3
     INTRODUCTION
     This study examines the characteristics, use and effects of tank guns and tank
     projectiles. It is part of a series of technical studies on explosive weapons
     undertaken by the GICHD, providing evidence and contributing to the analysis
     of the final report on Characterisation of Explosive Weapons (GICHD, 2017).
     Tanks are mobile, armoured, heavy weapons platforms that have been used in the
     majority of conflicts since World War II. Tanks differ from the other land-based
     weapon systems examined in this series of studies by employing primarily direct
     fire weapons; when firing its main gun, the gunner can see its target and aims
     directly at it, rather than firing at an indirect trajectory. Although technological
     advances have ensured modern tanks far exceed the performance of their prede-
     cessors, simultaneous advances in anti-tank systems have meant that most
     remain vulnerable to both conventional military forces and non-state actors
     employing asymmetric warfare techniques.
     This report covers tank guns of 115 mm, 120 mm, and 125 mm in calibre, which
     encompasses the majority of tank guns that have been produced since 1961,
     when the Soviet Union introduced the T-62 main battle tank (MBT). It is necessary
     to limit the scope of this study, and the increase of Soviet tank gun calibres
     from 100 mm to 120 mm in 1961 provides an appropriate cut-off point in time.
     Although the T-62 partially replaced the earlier T-55 model with its 100 mm main
     gun, T-55 tanks remain commonly encountered today. While HE and HE-FRAG
Annex D                                                                                                      Introduction    4
      ammunition does exist for tank guns, these are more commonly used by tank
      guns of Russian design. The majority of tank gun ammunition employed by
      modern militaries is dual-purpose in nature, designed to destroy enemy armoured
      fighting vehicles, whilst also offering a fragmentation effect for use in an anti-
      personnel role.
     Tanks often take on a high-profile role in modern conflicts. Capable of very high
     precision in their direct fire role, tanks have been involved extensively in attacks
     within populated areas.
Annex D                                                                                     Introduction   5
     TANK GUNS
     The majority of modern tanks are fitted with smootbore guns, which do not utilise
     rifled barrels in order to impart spin to projectiles as they are fired (see Annex A).
     A notable exception is the British Challenger 2 tank, which uses the 120 mm L30
     rifled gun. Unlike many other militaries armoured units, the British Army continue
     to use a rifled gun, as their primary tank ammunition is of the high explosive
     squash-head (HESH) type. HESH ammunition is used both as a general-purpose
     high explosive projectile, and also against other tanks and armoured vehicles.
     When a HESH ammunition is fired from a rifled barrel, spin imparted to the
     projectile helps ensure a predictable distribution of the plasticised explosive filler,
     and thus maximises its efficiency in the anti-tank role. The smootbore design of
     most modern tank barrels makes it easier for tanks to fire missiles through the
     same barrel used to fire projectiles.
                                                                           12
                                                                            20 mm L4
                                                                                   44
                                                                           12
                                                                            20 mm L5
                                                                                   55          Figure 1. 120 mm
                                                                                               smootbore tank guns
                                                                                               (image credit: Thai Military
                                                                                               and Asian Region).
     The gun itself is not the sole factor influencing the range of a tank during combat
     operations. Weapons may have both a maximum range, the farthest that a
     projectile will travel under optimal conditions, and an effective range. The
     definition of the latter varies by user, but is generally considered to be the
     maximum distance at which a weapon may be expected to be accurate and
     achieve the desired effect (DoD, 2016). The effective range should only be
     considered indicative. It varies with ammunition, training, sights used, whether
     the weapon platform is stable or mobile, weather conditions and other factors.
     For example, the Russian 115 mm 2A20 Molot tank gun fitted with the TSHS-41U
     telescopic sight and firing the 3OF18 HE-FRAG projectile has an effective range
     of 3000 m. At night, firing with the TPN-1 night sight, it is 800 m for all projectile
     types  a limitation of the sight, not the ammunition. However, the maximum
     range of the 3OF18 projectile at all times is 9500 m when fired at a gun angle of
     16 (Nikolskiy, 1997).
     The German Rheinmetall 120 mm smootbore gun is fitted to the German Leopard
     2 tank and to the American Abrams. It can also be found on tanks produced by
     Japan, South Korea, and Turkey. Owing to the widespread adoption of both the
     Leopard 2 and the Abrams, the Rheinmetall 120 mm gun is the most widely
     used weapon system in its class. This gun comes in two versions  the shorter
     L44, and the longer L55. Both versions can fire the same types of ammunition,
     the difference being that the longer L55 allows ammunition to generate a higher
     velocity, which can lead to better performance against other tanks for certain
     ammunition types (Rheinmetall Defence, 2016).
     The Russian-designed 115 mm 2A20 Molot gun is fitted to the T-62 tank,
     introduced into service in 1962. This was the first smootbore gun to be fitted to
     a tank (Tucker, 2004)). It can fire the 3OF18 HE-FRAG projectile out to an effective
     range of 3,000 m (Nikolskiy, 1997). This tank has been operated by numerous
     countries (IISS, 2016), and despite its relative age, it is still deployed by many
     armed forces.
     The Russian 125 mm 2A46 (D-81) smootbore gun has been widely adopted on
     Russian-designed tanks and their foreign copies and derivatives. Versions of this
     gun have been in use since 1964, and even some of the T-55 tanks, which were
     first introduced into service in 1958, have been retrofitted with this gun during
     modernisation programmes in Ukraine and China (Lavrov, 2016). The 2A46 has
     been updated since its introduction; its more modern version has been given the
     designation 2A46M-5, but both versions are very similar.
     Tank guns can typically fire a range of different projectiles, most commonly
     including anti-armour and multipurpose types, the latter used to engage light
     vehicles, personnel, and fortifications. Anti-armour warheads may be either
     chemical energy penetrators, or kinetic energy penetrators. The latter type
     is most commonly shaped like a dart or small-calibre rifle projectile, and are
     generally non-explosive (Cross et al., 2016). These are not examined in this study.
     Chemical energy penetrators rely on the energy of an explosive detonation
     generated when the munition functions on approaching or reaching its target
     (Meyers, 1994). Examples include shaped charge warheads (including high
     explosive anti-tank, or HEAT, and explosively formed penetrator, or EFP), high
     explosive squash-head (HESH) warheads, and other types. As these do not
     typically have wide-area effects relevant to their use in populated areas, they
     are not considered further in this study.
                                                                                              Figure 2. Illustration
                                                                                              showing the rounded head
                                                                                              and thin sides of a HESH
                                                                                              projectile (image credit:
                                                                                              British MoD).
      Projectiles fired from smootbore barrels lack a driving band at the rear, but do
      require an obturating band to provide both an effective gas seal, and as a means        1 Some projectiles may have more
      to stabilise and centre the projectile in the barrel (Goad & Halsey, 1982).               than one bourrelet.
      Many modern fuzes are multi-function types, allowing the required mode of
      operation to be selected immediately prior to firing. When using conventional
      fuzes, the correct type of fuze needs to be selected and fitted before loading.
      If the type of target changes, older fuzes may need to be removed and replaced
      by a different type, but more modern fuzes can simply be reprogrammed.
      More than 20 cases were studied where tank guns were involved. Five case
      studies were selected for this report on the basis of the confirmed use of these
      weapons, the accuracy of documentation, and to geographical distribution of
      conflicts across the weapon studies. These cover the period from October 1999
      to July 2014, and the following countries and territories: Russia, Libya and
      Palestine.
BRIEF DESCRIPTIONS
CASE STUDY No 1
CASE STUDY No 3
CASE STUDY No 4
CASE STUDY No 5
CASE STUDY
    01
                  DATE/TIME OF ATTACK
                  21 July 2014, unknown time.
                  LOCATION
                  Al Aqsa Martyrs Hospital, Deir el Balah, Gaza.
Figure 4.
                  WEAPON SYSTEM
                  120 mm tank gun, reportedly Merkava tanks.
                     DAMAGE
                     There was significant damage done to the hospital during this attack (see infra-
                     structure damage for details). Two ambulances trying to move the wounded
                     to Shifa hospital, in Gaza City, were then also hit. The shelling destroyed beds
                     and important medical equipment.
                     INFRASTRUCTURE DAMAGE
                     There was substantial infrastructure damage to the hospital (see Photos 6 to 9).
                     The third and fourth floors, the reception area, and the upper floor were all
                     badly damaged  one report concluded that the third and fourth floors were
                     completely destroyed. Several exterior walls of the hospital were damaged.
                     The attack also damaged the X-ray facilities, the maternity ward, the intensive
                     care unit, and the surgery department. Several operating rooms, key equipment
                     including hospital beds, and medical supplies were destroyed. An oxygen
                     production unit, which is used in a wide range of operations and procedures,
                     was also destroyed.
                     REMARKS
                     The attack did not only kill and injure patients in the hospital; approximately
                     30 of those injured were medical staff working at the hospital at the time.
                     One report cited Aqsa hospital in central Gaza as one of the only hospitals
                     providing services to several refugee camps, including al-Maghazi and
                     al-Nuseirat, as well as towns and villages including Deir el Balah and Juhu
                     al-Dik, which severely impeded access to medical treatment for the injured.
PHOTOS OF DAMAGE
Photo 7.
SOURCES
                      1.   Al Jazeera: http://www.aljazeera.com/news/middleeast/2014/07/deaths-as-israeli-tanks-
                           shell-gaza-hospital-2014721124111171397.html
                      2. The Independent: http://www.independent.co.uk/news/world/middle-east/israel-gaza-
                           conflict-tanks-shell-gaza-hospital-killing-four-and-wounding-30-medical-staff-as-seven-
                           9619055.html
                      3. Middle East Eye: http://www.middleeasteye.net/news/al-aqsa-hospital-hit-strikes-gazas-
                           medical-facilities-continue-1701468997
                      4. The Wall Street Journal: http://www.wsj.com/articles/gaza-hospital-attack-caught-
                           civilians-in-crossfire-1406158568
    02
                  DATE/TIME OF ATTACK
                  24 July 2014, at approximately 15:00.
                  LOCATION
                  UN School/Camp in Beit Hanoun, Gaza City.
Figure 5.
                  WEAPON SYSTEM
                  120 mm tank gun, reportedly one Merkava battle tank.
                  CASUALTIES/INJURED
                  15 killed, over 200 injured.
                     INFRASTRUCTURE DAMAGE
                     The school itself was very badly damaged (see Photos 10-12). It is reported that
                     an entire classroom collapsed on the people who were inside. One projectile
                     created a large hole in the ceiling of a second-floor classroom. Several ceilings
                     collapsed throughout the school.
                     REMARKS
                     The school was a UN-managed refugee centre, which was housing close to
                     1,500 people when it was attacked. According to survivors, one projectile
                     landed in the schoolyard, followed by several more rounds that hit the upper
                     stories of the building.
PHOTOS OF DAMAGE
SOURCES
    03
                                            DATE/TIME OF ATTACK
                                            18 March 2011, 07:00
                                            LOCATION
                                            Central Misrata, Libya
Figure 6.
                                            WEAPON SYSTEM
                                            125 mm tank guns, reportedly Russian-made T-72 battle tanks.
                                            CASUALTIES/INJURED
                                            25-35 deaths reported, including children.
                                            INFRASTRUCTURE DAMAGE
                                            Shells hit several mosques, schools, and residential buildings. According to one
                                            report, a hospital in the city was badly damaged during the fighting. Scenes in
                                            one video 2 show glass, rubble, and wrecked medical equipment littering the
                                            floors of the abandoned medical facility. A gaping hole is seen in one of the
                                            hospitals walls.
      2 http://www.telegraph.co.uk/news/
        worldnews/africaandindianocean/
        libya/8405273/Libya-Misurata-
        hospital-damaged-in-fighting.html
                     PHOTOS OF DAMAGE
                     Misrata came under heavy fire throughout the final months of the Gaddafi
                     regime, thus it is not possible to determine exactly what structural damage
                     was caused in the attack on 18 March, and what may have already existed.
Photo 15.
Photo 16.
SOURCES
    04
                  DATE/TIME OF ATTACK
                  5 October 1999, 14:00.
                  LOCATION
                  Chervlennaya (cited as Chervlyonnaya), Chechnya Russia.
                  WEAPON SYSTEM
                  125 mm tank gun, Russian-made battle tank of an unspecified model.
                  CASUALTIES/INJURED
                  Exact casualties varied from report to report, but there seems to have been
                  at least 45 civilians (mostly women and children) on the bus when it was hit.
                  The most commonly cited number of those killed was 28, with approximately
                  17 people being injured.
                  DAMAGE
                  The majority of the damage was to the bus itself. According to reports, it was
                  completely wrecked, torn into two pieces and almost completely burned.
                  INFRASTRUCTURE DAMAGE
                  No reports of infrastructure damage.
SOURCES
    05
                  DATE/TIME OF ATTACK
                  20 July 2014, throughout the evening.
                  LOCATION
                  Ash Shijaiyah, Gaza City.
Figure 8.
                  WEAPON SYSTEM
                  120 mm tank gun, Merkava battle tank.
                  CASUALTIES
                  65 people killed, reports of 100 injured.
                  DAMAGE
                  Reports indicate that during this particular attack residential homes were hit,
                  leading to considerable infrastructure damage to homes and shelters.
                  INFRASTRUCTURE DAMAGE
                  Dozens of houses over several blocks were destroyed or badly damaged.
                  The ICRC reported that they rescued 11 civilians from the rubble.
PHOTOS OF DAMAGE
Photo 17.
SOURCES