An Iraqi Federal Police member fires an RPG towards Islamic State militants during a battle in western Mosul, Iraq, May 28, 2017. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY 

A journalist fires an RPG, with Laser Simulation equipment (LASSIM), during Swiss defence equipment provider RUAG media day at the Swiss army base in Bure, Switzerland April 26, 2017. REUTERS/Denis Balibouse 

A member of the Iraqi Federal Police fires an RPG during combat against the Islamic State in western Mosul, Iraq, April 13, 2017. REUTERS/Andres Martinez Casares 

An Iraqi Federal Police member fires an RPG towards Islamic State militants during a battle in Mosul, Iraq April 4, 2017 . REUTERS/Khalid al Mousily 

An Iraqi Federal Police member fires an RPG towards Islamic State militants during a battle in Mosul, Iraq April 4, 2017 . REUTERS/Khalid al Mousily 

A weapon hangs on a wall as a RPG gun stands in a house used by the Iraqi Federal Police during their fight against the Islamic State in Mosul, Iraq, April 2, 2017. REUTERS/Andres Martinez Casares 

RPG rockets are stored in a box at a house used by the Iraqi Federal Police during the fight against the Islamic State in Mosul, Iraq, April 2, 2017. REUTERS/Andres Martinez Casares 

An Iraqi Federal Police member fires an RPG towards Islamic State positions during combats in Mosul, Iraq, April 1, 2017. REUTERS/Andres Martinez Casares 

An unexploded rocket propelled grenade lies inside a cement water catchment in the village of Nialdhiu, northern South Sudan, February 7, 2017. REUTERS/Siegfried Modola SEARCH "FAMILY MODOLA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An Iraqi soldier carries a RPG as he walks among wreckage of buildings damaged from clashes in the frontline during a battle with Islamic State militants in the neighbourhood of Intisar, eastern Mosul, Iraq, December 6, 2016. REUTERS/Ahmed Jadallah 

An Iraqi soldier fires a RPG toward Islamic State militants during clashes in the frontline in the neighbourhood of Intisar, eastern Mosul, Iraq, December 6, 2016. REUTERS/Ahmed Jadallah 

A Houthi rebel holds holds an RPG weapon during a rally held to mobilise fighters for the battles against government forces, in Sanaa, Yemen December 1, 2016. REUTERS/Mohamed al-Sayaghi 

An Iraqi soldier runs for cover after he fires a RPG during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic 

An Iraqi soldier fires a RPG during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic 

A pro-Houthi tribesman holds an RPG weapon during a gathering held to mobilize fighters for battles against government forces, in Sanaa, Yemen November 24, 2016. REUTERS/Khaled Abdullah 

A member of Shi'ite fighters carries a RPG during a battle with Islamic State militants at the airport of Tal Afar west of Mosul, Iraq November 18, 2016. REUTERS/Thaier Al-Sudani 

An Iraqi special forces policeman carries a RPG in Karamah, south of Mosul, Iraq November 12, 2016. REUTERS/Goran Tomasevic

An Iraqi special forces policeman carries a RPG in Karamah, south of Mosul, Iraq November 12, 2016. REUTERS/Goran Tomasevic

An Iraqi soldier stands after he fires a RPG in Karamah, south of Mosul, Iraq November 10, 2016. REUTERS/Goran Tomasevic

An Iraqi soldier fires a RPG in Karamah, south of Mosul, Iraq November 10, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Members of an Iraqi special forces police unit fire their weapons at Islamic State fighters in al-Shura, south of Mosul, Iraq October 29, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Palestinian militant of the National Resistance brigades, the armed wing of the Democratic Front for the Liberation of Palestine (DFLP), holds a rocket-propelled grenade (RPG) as he gets out of a tunnel during a graduation ceremony in Rafah in the southern Gaza Strip October 28, 2016. REUTERS/Ibraheem Abu Mustafa 

A Kurdish Peshmerga fighter with a Milan anti tank weapon guards against possible Islamic State suicide bomb attacks during a battle with Islamic State militants at Topzawa village, near Bashiqa, near Mosul, Iraq, October 24, 2016. REUTERS/Ahmed Jadallah 

A Kurdish Peshmerga fighter with Milan anti tank weapon guards against possible Islamic State suicide bomb attacks during a battle with Islamic State militants at Topzawa village, near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

A Kurdish Peshmerga fighter with Milan anti tank weapon guards against possible Islamic State suicide bomb attacks during a battle with Islamic State militants at Topzawa village, near Bashiqa, near Mosul, Iraq October 24, 2016. REUTERS/Ahmed Jadallah 

An Iraqi special forces soldier fires an RPG during clashes with Islamic States fighters in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

An Iraqi special forces soldier fires a RPG during clashes with Islamic States fighters in Bartella, east of Mosul, Iraq October 20, 2016. REUTERS/Goran Tomasevic 

Peshmerga forces prepare their anti-tank guided missiles in front of Islamic state militants' positions at the town of Naweran near Mosul, Iraq October 20, 2016. REUTERS/Zohra Bensemra 

Peshmerga forces prepare their anti-tank guided missiles in front of Islamic state militants' positions at the town of Naweran near Mosul, Iraq October 20, 2016. REUTERS/Zohra Bensemra 

Peshmerga forces prepare their anti-tank guided missiles in front of Islamic State militants' positions in town of Naweran near in Mosul, Iraq October 20, 2016. REUTERS/Zohra Bensemra 

A woman loyal to the Houthi movement hold an RPG weapon as she takes part in a parade to show support for the movement in Sanaa, Yemen September 6, 2016. REUTERS/Khaled Abdullah TPX IMAGES OF THE DAY

A woman loyal to the Houthi movement holds an RPG weapn as she takes part in a parade to show support for the movement in Sanaa, Yemen September 6, 2016. REUTERS/Khaled Abdullah 

A woman loyal to the Houthi movement hold an RPG weapon as she takes part in a parade to show support for the movement in Sanaa, Yemen September 6, 2016. REUTERS/Khaled Abdullah 

Fighters from Libyan forces allied with the U.N.-backed government take cover during a battle with Islamic State fighters in Sirte, Libya August 21, 2016. Picture taken August 21, 2016. REUTERS/Hani Amara

Fighters from Libyan forces allied with the U.N.-backed government take position during a battle with Islamic State fighters in Sirte, Libya August 21, 2016. Picture taken August 21, 2016. REUTERS/Hani Amara

Fighters from Libyan forces allied with the U.N.-backed government take position during a battle with Islamic State fighters in neighborhood Number One in Sirte, Libya August 17, 2016. Picture taken August 17, 2016. REUTERS/Ismail Zitouny

A fighter of Libyan forces allied with the U.N.-backed government prays in front of his sniper rifle during a battle with Islamic States fighters in Sirte, Libya, July 21, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Libyan forces allied with the U.N.-backed government fire weapons during a battle with IS fighters in Sirte, Libya, July 21, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

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 

A Somali boy plays with a toy model of a rocket-propelled grenade (RPG) after attending Eid al-Fitr prayers to mark the end of the fasting month of Ramadan in Somalia's capital Mogadishu, July 6, 2016. REUTERS/Feisal Omar TPX IMAGES OF THE DAY

A Somali boy plays with a toy model of a rocket-propelled grenade (RPG) after attending Eid al-Fitr prayers to mark the end of the fasting month of Ramadan in Somalia's capital Mogadishu, July 6, 2016. REUTERS/Feisal Omar 

A fighter from forces aligned with Libya's new unity government fires an RPG at Islamic State fighters positioned in the Algharbiyat area in Sirte, June 21, 2016. REUTERS/Stringer 

A member of the Shi'ite Badr Organisation carries a rocket-propelled grenade (RPG) in Saqlawiya, north of Falluja, Iraq, June 5, 2016. REUTERS/Thaier Al-Sudani 

A member of the Shi'ite Badr Organisation carries a rocket-propelled grenade (RPG) in Saqlawiya, north of Falluja, Iraq, June 5, 2016. REUTERS/Thaier Al-Sudani 

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 

Britain's Prince Harry, right, speaks to Martyn Compton, a former British soldier from the Household Cavalry Regiment who suffered his injuries after an RPG set his vehicle alight in Afghanistan, as he attends the Lord Mayor's Big Curry Lunch in aid of the ABF The Soldiers Charity, in London, Britain, April, 7, 2016. REUTERS/Alastair Grant/Pool 

Britain's Prince Harry, right, speaks to Martyn Compton, a former British soldier from the Household Cavalry Regiment who suffered his injuries after an RPG set his vehicle alight in Afghanistan, as he attends the Lord Mayor's Big Curry Lunch in aid of the ABF The Soldiers Charity, in London, Britain, April, 7, 2016. REUTERS/Alastair Grant/Pool 

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

Incumbent president Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG), wavess as he leaves the polling station during a presidential election in Conakry, Guinea October 11, 2015. REUTERS/Luc Gnago 

Incumbent president Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG), casts his vote at a polling station during a presidential election in Conakry, Guinea October 11, 2015. REUTERS/Luc Gnago 

Supporters of former prime minister and presidential candidate Cellou Dalein Diallo of the Union of Democratic Forces of Guinea (UFDG) complain to security forces during a confrontation with supporters of Guinea's President and leader of Rally of the Guinean People (RPG) Alpha Conde, on a main road during an electoral rally of UFDG in Conakry, October 8, 2015. Guinea's President Alpha Conde said on Thursday he had no plans to postpone this weekend's election, dismissing a request from the opposition for more time to fix alleged irregularities. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago 

Supporters of former prime minister and presidential candidate Cellou Dalein Diallo of the Union of Democratic Forces of Guinea (UFDG) complain to security forces during a confrontation with supporters of Guinea's President and leader of Rally of the Guinean People (RPG) Alpha Conde (not pictured), on a main road during an electoral rally of UFDG in Conakry, October 8, 2015. Guinea's President Alpha Conde said on Thursday he had no plans to postpone this weekend's election, dismissing a request from the opposition for more time to fix alleged irregularities. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

Supporters of Former prime minister and presidential candidate Cellou Dalein Diallo of the Union des forces democratiques de Guinee (UFDG) complain to security forces during a confrontation with partisans of Guinea's outgoing president, leader of Rassemblement du Peuple de Guinea (RPG) on a main road during the electoral rally of UFDG in Conacry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

Supporters of Former prime minister and presidential candidate Cellou Dalein Diallo of the Union des forces democratiques de Guinee (UFDG) complain to security forces during a confrontation with partisans of Guinea's outgoing president, leader of Rassemblement du Peuple de Guinea (RPG) on a main road during the electoral rally of UFDG in Conacry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

Supporters of Former prime minister and presidential candidate Cellou Dalein Diallo of the Union des forces democratiques de Guinee (UFDG) shout during the confrontation with partisans of Guinea's outgoing president, leader of Rassemblement du Peuple de Guinea (RPG) on a main road during the electoral rally of UFDG in Conacry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago 

Supporters of Former prime minister and presidential candidate Cellou Dalein Diallo of the Union des forces democratiques de Guinee (UFDG) run during a confrontation with partisans of Guinea's outgoing president, leader of Rassemblement du Peuple de Guinea (RPG) on a main road during the electoral rally of UFDG in Conacry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago 

A poster of Guinea's outgoing president and presidential candidate Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG) is seen at a junction of Kaloum in Conakry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

A poster of Guinea's outgoing president and presidential candidate Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG) is seen at a junction of Kaloum in Conakry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

A poster of Guinea's outgoing president and presidential candidate Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG) is seen at a junction of Kaloum in Conakry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago

People walk next to a campaign poster of Guinea's outgoing president and presidential candidate Alpha Conde, leader of Rassemblement du Peuple de Guinea (RPG) at a junction of Kaloum in Conakry, October 8, 2015. Guinea will hold its presidential election on Sunday. REUTERS/Luc Gnago