Kurdish Peshmerga fighters inspect an rocket-propelled grenade (RPG) launcher as they take control of the area, on the outskirts of Mosul February 6, 2015. REUTERS/Ari Jalal/File Photo 

Gun enthusiasts poses for a picture with an FN MK 48 machine gun and a MK 19 grenade launcher at the National Rifle Association's (NRA) annual meetings & exhibits show in Louisville, Kentucky, May 21, 2016. REUTERS/John Sommers II 

An Afghan National Army (ANA) soldier fires a rocket-propelled grenade (RPG) launcher at an outpost in Marjah district of Helmand province, Afghanistan May 20, 2016. REUTERS/ Abdul Mailk 

Members of Afghan Quick Reaction Force (QRF) talk among themselves during an operation near the Indian consulate in Mazar-i-Sharif, Afghanistan January 4, 2016. Afghan special forces prepared to clear insurgents barricaded in a house near the Indian consulate in the northern city of Mazar-i-Sharif on Monday after an overnight attack that coincided with an assault on an Indian air base near the border with Pakistan. REUTERS/Anil Usyan 

A member of Afghan Quick Reaction Force (QRF) fires a rocket-propelled grenade (RPG) launcher during an operation near the Indian consulate in Mazar-i-Sharif, Afghanistan January 4, 2016. Afghan special forces prepared to clear insurgents barricaded in a house near the Indian consulate in the northern city of Mazar-i-Sharif on Monday after an overnight attack that coincided with an assault on an Indian air base near the border with Pakistan. REUTERS/Anil Usyan TPX IMAGES OF THE DAY

Members of the National Guard of Ukraine fire grenade launchers during military tactical exercises at a training base near Kiev, Ukraine, July 22, 2015. REUTERS/Valentyn Ogirenko 

Members of the Ukrainian armed forces fire a grenade launcher, in response to what servicemen said were shots fired from the positions of fighters of the separatist self-proclaimed Donetsk People's Republic, in the town of Avdiivka in Donetsk region, Ukraine, June 18, 2015. Picture taken June 18, 2015. REUTERS/Maksim Levin 

Members of the Ukrainian armed forces fire a grenade launcher, following what servicemen said was a shooting attack from the positions of fighters of the separatist self-proclaimed Donetsk People's Republic, in Avdiivka in Donetsk region, Ukraine, June 18, 2015. REUTERS/Maksim Levin TPX IMAGES OF THE DAY

British Ghurkas attend the multinational NATO exercise Saber Strike in Adazi, Latvia, June 11, 2015. The annual training this year involves more than 6,000 troops from 13 NATO countries and covers the territories of Latvia, Estonia, Lithuania and Poland. Soldiers from Canada, Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Norway, Poland, Portugal, Slovenia, the United Kingdom and the United States have been taking part in the 2015 edition of the exercise, which has been held annually since 2010. REUTERS/Ints Kalnins

An Afghan security force looks out from the windshield of an armoured car at the site of an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Mohammad Ismail

Afghan firefighters spray water to wash the site of an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Mohammad Ismail

Afghan security force and NATO troops stand at the gate of a guesthouse after an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

An Afghan policeman inspects the wreckage of a car after a Taliban attack on a guesthouse in Kabul May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

Afghan policemen stand guard near the site of an attack in Kabul, Afghanistan May, 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

Afghan policemen stand guard near the site of an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

Afghan security force stand at the gate of a guesthouse after an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Mohammad Ismail

Afghan policemen stand guard near the site of an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

Afghan policemen stand guard near the site of an attack in Kabul, Afghanistan May 27, 2015. Four Taliban insurgents armed with assault rifles and a grenade launcher stormed a guesthouse in the diplomatic quarter of the Afghan capital overnight and held out for hours until they were killed by government forces early on Wednesday, officials said. REUTERS/Omar Sobhani

Markian Lubkivskyi, advisor of the Ukraine's Security Service (SBU) head, demonstrates Kalashnikov automatic rifle with grenade launcher seized from a man, whom according to SBU ia one of two Russian servicemen recently detained by Ukrainian forces, during a news conference in Kiev, Ukraine, May 21, 2015. Ukraine on Monday accused two Russian servicemen it said it had captured of being part of a special forces group that had killed and wounded Ukrainian servicemen in fighting in its eastern regions and said they would be prosecuted for "terrorist acts". Russia on Monday restated its position that there were no Russian troops in Ukraine. REUTERS/Valentyn Ogirenko 

Markian Lubkivskyi, advisor of the Ukraine's Security Service (SBU) head, demonstrates Kalashnikov automatic rifle with grenade launcher seized from a man, whom according to SBU ia one of two Russian servicemen recently detained by Ukrainian forces, during a news conference in Kiev, Ukraine, May 21, 2015. Ukraine on Monday accused two Russian servicemen it said it had captured of being part of a special forces group that had killed and wounded Ukrainian servicemen in fighting in its eastern regions and said they would be prosecuted for "terrorist acts". Russia on Monday restated its position that there were no Russian troops in Ukraine. REUTERS/Valentyn Ogirenko 

A riot policeman points a tear gas grenade launcher during a clash of rival groups in the jail of Cancun, Mexico April 26, 2015. REUTERS/Victor Ruiz Garcia

Newly mobilized Ukrainian paratroopers carry an anti-tank grenade launcher during a military drill near Zhytomyr April 9, 2015. REUTERS/Valentyn Ogirenko 

Newly mobilized Ukrainian paratroopers fire anti-tank grenade launchers during a military drill near Zhytomyr April 9, 2015. REUTERS/Valentyn Ogirenko 

A newly mobilized Ukrainian paratrooper fires an anti-tank grenade launcher during a military drill near Zhytomyr April 9, 2015. REUTERS/Valentyn Ogirenko 

A newly mobilized Ukrainian paratrooper fires an anti-tank grenade launcher during a military drill near Zhytomyr April 9, 2015. REUTERS/Valentyn Ogirenko 

A Libya Dawn fighter shoulders a rocket-propelled grenade (RPG) launcher at a checkpoint near Sirte March 17, 2015. The Libya Dawn armed group backs the self-declared government in the capital Tripoli. Islamic State has been exploiting the turmoil in Libya, where the internationally recognised government of Libyan Prime Minister Abdullah al-Thinni and the administration in Tripoli and their respective allies are fighting for power. REUTERS/Goran Tomasevic (LIBYA - Tags: CIVIL UNREST POLITICS MILITARY) 

A Libya Dawn fighter runs with a rocket-propelled grenade (RPG) launcher as he searches with other fighters for Islamic State militants near Sirte March 17, 2015. The Libya Dawn armed group backs the self-declared government in the capital Tripoli. Islamic State has been exploiting the turmoil in Libya, where the internationally recognised government of Libyan Prime Minister Abdullah al-Thinni and the administration in Tripoli and their respective allies are fighting for power. REUTERS/Goran Tomasevic (LIBYA - Tags: CIVIL UNREST POLITICS MILITARY) 

A member of the Iraqi security forces carries a rocket-propelled grenade launcher, in the town of Tal Ksaiba, near the town of al-Alam, March 7, 2015. Iraqi security forces and Shi'ite militia fighters struggled to advance on Saturday into the two towns of al-Alam and al-Dour near Tikrit, their progress slowed by fierce defence from Islamic State militants. REUTERS/Thaier Al-Sudani (IRAQ - Tags: POLITICS CIVIL UNREST CONFLICT) 

Newly mobilized Ukrainian paratroopers fire an anti-tank grenade launcher during a military drill near Zhytomyr March 6, 2015. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: MILITARY POLITICS CIVIL UNREST CONFLICT) 

A Shi'ite fighter walks with a rocket-propelled grenade launcher in the town of Hamrin in Salahuddin province March 3, 2015. Wearing military fatigues and a white turban, Shi'ite cleric Sheikh Ahmed al-Rubaei gave an eve-of-battle address to Iran-backed fighters preparing to attack Islamic State militants in Tikrit, praising them for defending their faith and urging them to fight honourably. This week's multi-pronged attack is the biggest coordinated assault on the city since the radical Islamic State fighters seized it in June, and also the clearest example of how Tehran, rather than Washington, is now playing a more important role on the battlefield in a war that sees both Iran and the United States supporting the same side against a common foe. Picture taken March 3, 2015. To match Insight MIDEAST-CRISIS/IRAQ-FRONT REUTERS/Thaier Al-Sudani (IRAQ - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY) 

People look at portable grenade launchers during the opening of an exhibition displaying military weapons and vehicles seized from pro-Russian separatists during fighting in eastern Ukraine, in central Kiev February 21, 2015. The exhibit shows military weapons which are of Russian origin, according to organizer Ukraine's Presidential Administration. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: CIVIL UNREST MILITARY) 

Kurdish Peshmerga fighters inspect an rocket-propelled grenade (RPG) launcher as they take control of the area, on the outskirts of Mosul February 6, 2015. REUTERS/Ari Jalal (IRAQ - Tags: CIVIL UNREST CONFLICT MILITARY POLITICS) 

A pro-Russian separatist fires an automatic grenade launcher from his position during fighting with Ukrainian government forces near the Sergey Prokofiev International Airport in Donetsk, eastern Ukraine, October 9, 2014. REUTERS/Shamil Zhumatov (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT) 

A Kurdish Peshmerga fighter holds a a rocket-propelled grenade launcher as he takes up position in an area overlooking Baretle village (background), which is controlled by the Islamic State, in Khazir, on the edge of Mosul September 8, 2014. The Kurdish fighters are firing from an area they had retaken from the Islamic State, on Bashiqah mountain. September 8, 2014. REUTERS/Ahmed Jadallah (IRAQ - Tags: CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

A Kurdish peshmerga fighter takes up position with a rocket-propelled grenade (RPG) launcher at the front line against the Islamic State, in Khazir September 7, 2014. Islamic State launched a lightning advance through northern and central Iraq in June, declaring an Islamic caliphate. With the help of U.S. air strikes, Iraq's army and Kurdish forces have been able to push the fighters back from some areas. REUTERS/Ahmed Jadallah (IRAQ - Tags: CIVIL UNREST CONFLICT) 

A pro-Russian separatist checks an automatic grenade launcher mounted in a vehicle at a check point on the outskirts of Donetsk September 6, 2014. An uneasy calm prevailed in eastern Ukraine on Saturday after Ukrainian forces and pro-Russian separatists signed a ceasefire as part of a drive to end a war that has triggered a deep crisis in relations between Russia and the West. REUTERS/Maxim Shemetov (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY) 

Foreign military attaches and media look at grenade launchers seized from pro-Russian separatists in the eastern regions of Ukraine, in Kiev August 29, 2014. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT) 

A Ukrainian officer gives explanations as foreign military attaches and media look at grenade launchers seized from pro-Russian separatists in the eastern regions of Ukraine, in Kiev August 29, 2014. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY) 

A Ukrainian serviceman shoots with a grenade launcher after seeing something suspicious at a military camp in Luhansk region August 21, 2014. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: CONFLICT POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A boy holds a grenade launcher at a new exhibition of weapons and military vehicles recently seized from pro-Russian separatists, at the Ukrainian State Museum of the Great Patriotic War of 1941-1945 Years in Kiev July 12, 2014. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY SOCIETY) 

Visitors try a handheld anti-tank grenade launcher simulator at the MILEX-2014 arms and military equipment international exhibition in Minsk July 9, 2014. REUTERS/Vasily Fedosenko (BELARUS - Tags: MILITARY SOCIETY) 

Rocket-propelled grenades seized in raids following a military coup on May 22, are displayed during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST MILITARY CRIME LAW) 

A military police officer stands next to weapons seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST MILITARY CRIME LAW) 

Thai soldiers and police officers look at weapons seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST MILITARY CRIME LAW) 

Thai police officers display to the media weapons seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST MILITARY CRIME LAW) 

A police officer holds rocket-propelled grenades seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST) 

Thai soldiers and police officers look at weapons seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT, were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST MILITARY CRIME LAW) 

Thai soldiers and police officers look at weapons seized in raids following a military coup on May 22, during a news conference at the military barracks in Bangkok June 29, 2014. The amount of illegal firearms found in the search, arrest and seizure operation that took place from May 22 to June 25 consisted of 1,996 guns, 31,840 rounds of ammunition and 256 explosive devices in total. Of this amount, 144 rifles and machine guns, 258 shotguns, 2,490 pistols, 23 M-79 grenade launchers, 9 rocket-propelled grenade (RPG) launchers, 330 hand grenades and 134 explosive devices such as TNT were associated with illegal armed groups, according to the Public Relation Center of the Peace and Order Maintaining Task Force. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

Thai police officers display to the media weapons seized in raids following a military coup on May 22, during a news conference at the Provincial Police Region headquarters in Bangkok, June 5, 2014. Thailand's military council has ordered that "war weapons" including explosive devices and grenade launchers, are surrendered to local authorities by June 10 as part of a nationwide crackdown to stop political violence. REUTERS/Athit Perawongmetha (THAILAND - Tags: POLITICS CIVIL UNREST) 

Thai police officers display to the media weapons seized in raids following a military coup on May 22, during a news conference at the Provincial Police Region headquarters in Bangkok, June 5, 2014. Thailand's military council has ordered that "war weapons" including explosive devices and grenade launchers, are surrendered to local authorities by June 10 as part of a nationwide crackdown to stop political violence. REUTERS/Athit Perawongmetha (THAILAND - Tags: POLITICS CIVIL UNREST) 

Thai police officers display to the media weapons seized in raids following a military coup on May 22, during a news conference at the Provincial Police Region headquarters in Bangkok, June 5, 2014. Thailand's military council has ordered that "war weapons" including explosive devices and grenade launchers, are surrendered to local authorities by June 10 as part of a nationwide crackdown to stop political violence. REUTERS/Athit Perawongmetha (THAILAND - Tags: POLITICS CIVIL UNREST) 

A Thai police officer displays a gun to the media alongside other weapons seized in raids following a military coup on May 22, during a news conference at the Provincial Police Region headquarters in Bangkok, June 5, 2014. Thailand's military council has ordered that "war weapons" including explosive devices and grenade launchers, are surrendered to local authorities by June 10 as part of a nationwide crackdown to stop political violence. REUTERS/Athit Perawongmetha (THAILAND - Tags: POLITICS CIVIL UNREST) 

A Thai police officer displays to the media weapons seized in raids following a military coup on May 22, during a news conference at the Provincial Police Region headquarters in Bangkok, June 5, 2014. Thailand's military council has ordered that "war weapons" including explosive devices and grenade launchers, are surrendered to local authorities by June 10 as part of a nationwide crackdown to stop political violence. REUTERS/Athit Perawongmetha (THAILAND - Tags: POLITICS CIVIL UNREST) 

A rebel fighter launches a rocket towards a regime's post where forces loyal to Syria's President Bashar al-Assad are located, ahead of a mission to seize the post, rebel fighters said, in Idlib countryside April 7, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

Free Syrian Army fighters prepare a rocket propelled grenade launcher before heading to the front line in Khan Sheikhoun in northern Idlib province April 2, 2014. Picture taken April 2, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

A masked militant of Al-Nasir brigades marches with a rocket-propelled grenade (RPG) launcher during an anti-Israeli protest in Gaza City March 31, 2014. REUTERS/Mohammed Salem (GAZA - Tags: POLITICS CIVIL UNREST) 

A man believed to be a Russian serviceman walks as he carries two rocket-propelled grenade (RPG) launchers while he and his comrades change shifts, near a military base in Perevalnoye, near the Crimean city of Simferopol, March 20, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: MILITARY POLITICS) 

Free Syrian Army fighters prepare to launch an anti-tank missile in Ashrafieh, Aleppo September 25, 2013. REUTERS/Muzaffar Salman (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

A member of the "Liwaa al-Sultan Mrad" brigade, operating under the Free Syrian Army, holds an RPG launcher in Aleppo's Bustan al-Basha district September 19, 2013. REUTERS/Molhem Barakat (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

A Cambodian Mine Action Center (CMAC) personnel (C) arrives to a cordoned-off location near Freedom Park, where Cambodian security officials discovered three M-79 grenade launcher shells, in Phnom Penh, September 13, 2013. REUTERS/Samrang Pring (CAMBODIA - Tags: POLITICS CIVIL UNREST)