Forces

Houthi fighters ride on the back of a truck during a tribal gathering held to mobilize fighters for the battles against government forces, in Sanaa, Yemen November 24, 2016. REUTERS/Khaled Abdullah

Khaled Abdullah/Reuters

Houthi fighters ride on the back of a truck during a tribal gathering held to mobilise fighters for the battles against government forces, in Sana’a, Yemen. Photo Khaled Abdullah/Reuters 

Iraqis and Iraqi forces members bathe in a sulphur pond in the Hamam al-Alil area, about 14 kilometres from the southern outskirts of Mosul, on November 7, 2016, after recapturing it from Islamic State (IS) group jihadists during the ongoing operation to regain control of the city of Mosul from the group. / AFP PHOTO / AHMAD AL-RUBAYEAHMAD AL-RUBAYE/AFP/Getty Images

Ahmad Al-Rubaye/AFP/Getty Images

Iraqis and Iraqi forces members bathe in a sulphur pond in the Hamam al-Alil area, about 14 kilometres from the southern outskirts of Mosul after recapturing it from Islamic State (IS) group jihadists during the ongoing operation to regain control of the city of Mosul from the group. Photo Ahmad Al-Rubaye/AFP/Getty Images

Syrian government forces walk in the strategic area of the Bazo hilltop, north of Khan Tuman on the southern outskirts of the northern embattled Syrian city of Aleppo as they advance in the ongoing offensive to the seize rebel-held eastern part of the city on October 25, 2016.

Georges Ourfalian/AFP/Getty

Syrian government forces walk in the strategic area of the Bazo hilltop, north of Khan Tuman on the southern outskirts of the northern embattled Syrian city of Aleppo as they advance in the ongoing offensive to the seize rebel-held eastern part of the city. Photo Georges Ourfalian/AFP/Getty

A member of Syria's pro-government forces guards a look out point as they advance Aleppo's rebel-held Bustan al-Basha neighbourhood on October 6, 2016. "Syrian regime forces advanced from the city centre north into (rebel-held) Bustan al-Basha, and seized a large athletic complex there," the UK-based Syrian Observatory for Human Rights said. This was the first time the regime had entered the district since 2013 and there had been fierce clashes, they added.      This was the first time the regime had entered the district since 2013 and there had been fierce clashes, he added.   / AFP PHOTO / GEORGE OURFALIANGEORGE OURFALIAN/AFP/Getty Images

George Ourfalian/AFP

A member of Syria’s pro-government forces guards a look out point as they advance Aleppo’s rebel-held Bustan al-Basha neighbourhood.”Syrian regime forces advanced from the city centre north into (rebel-held) Bustan al-Basha, and seized a large athletic complex there,” the UK-based Syrian Observatory for Human Rights said. This was the first time the regime had entered the district since 2013 and there had been fierce clashes, they added. Photo George Ourfalian/AFP 

A member of the Kurdish police known as the Asayesh, observes enemy positions from a lookout point in the northeastern Syrian city of Hasakeh during ongoing fighting with regime forces on August 22, 2016. Fierce overnight clashes with regime forces allowed the Kurds to advance mostly in the south of the city, the Syrian Observatory for Human Rights said.   / AFP PHOTO / DELIL SOULEIMANDELIL SOULEIMAN/AFP/Getty Images

Delil Souleiman/AFP/Getty

A member of the Kurdish police known as the Asayesh, observes enemy positions from a lookout point in the northeastern Syrian city of Hasakeh during ongoing fighting with regime forces 

Iraqi government forces are seen near the Falahat village west of Fallujah on June 27, 2016.  Iraqi forces took the Islamic State group's last positions in the city of Fallujah on June 26, establishing full control over one of the jihadists' most emblematic bastions after a month-long operation

Moadh Al-Dulaimi/AFP/Getty Images

Iraqi government forces are seen near the Falahat village west of Fallujah on June 27, 2016. Iraqi forces took the Islamic State group’s last positions in the city of Fallujah on Sunday, establishing full control over one of the jihadists’ most emblematic bastions after a month-long operation

Iraqi security forces gather near Falluja, Iraq, May 31, 2016.  REUTERS/Alaa Al-Marjani

Alaa Al-Marjani/Reuters

Iraqi security forces gather near Fallujah, Iraq

Military personnel, believed to be Russian servicemen, stand guard outside the territory of a Ukrainian military unit in the village of Perevalnoye outside Simferopol...Military personnel, believed to be Russian servicemen, stand guard outside the territory of a Ukrainian military unit in the village of Perevalnoye outside Simferopol March 3, 2014. Ukraine mobilised for war on Sunday and Washington threatened to isolate Russia economically after President Vladimir Putin declared he had the right to invade his neighbour in Moscow's biggest confrontation with the West since the Cold War. Russian forces have already bloodlessly seized Crimea, an isolated Black Sea peninsula where Moscow has a naval base. REUTERS/David Mdzinarishvili (UKRAINE - Tags: POLITICS MILITARY CIVIL UNREST)

David Mdzinarishvili/Reuters

Military personnel, believed to be Russian servicemen, stand guard outside the territory of a Ukrainian military unit in the village of Perevalnoye, outside Simferopol. Ukraine mobilised for war on Sunday and Washington threatened to isolate Russia economically after President Vladimir Putin declared he had the right to invade his neighbour in Moscow’s biggest confrontation with the west since the Cold War 

A Free Syrian Army member reacts after firing towards positions of pro-Assad regime forces in Deir al-Zor...A Free Syrian Army member reacts after they fire towards positions of pro-Bashar al-Assad regime forces in Deir al-Zor, July 7, 2013.  REUTERS/Khalil Ashawi (SYRIA - Tags: CIVIL UNREST CONFLICT)

Khalil Ashawi/Reuters

A Free Syrian Army member reacts after they fire towards positions of pro Bashar al-Assad regime forces in Deir al-Zor, Syria, on Sunday