A Kurdish fighter from the People's Protection Units (YPG) rides on a pick-up truck mounted with an anti-aircraft weapon in the Ghwairan neighborhood of Hasaka, Syria, August 22, 2016. The Arabic on the wall reads, "Bashar al-Assad is the glory and the pride of the nation." REUTERS/Rodi Said 

Members of al Qaeda's Nusra Front ride on a pick-up truck mounted with an anti-aircraft weapon in the town of the northwestern city of Ariha, after a coalition of insurgent groups seized the area in Idlib province, May 29, 2015. The Syrian army has pulled back from the northwestern city of Ariha after a coalition of insurgent groups seized the last city in Idlib province in northwestern Syria near the Turkish border that was still held by the government. A coalition of rebel groups called Jaish al Fateh, or Conquest Army, said it had taken over the city. Syria's al Qaeda offshoot Nusra Front is a major part of the coalition. REUTERS/Ammar Abdullah 

Free Syrian Army fighters fire an anti-aircraft gun towards a jet loyal to Syria's President Bashar al-Assad at the countryside in Idlib May 15, 2014. Picture taken May 15, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

A member of a heavily-armed militia group is seen with his weapon in Freedom Square in Benghazi February 18, 2014. A heavily-armed militia group threatened on Tuesday to remove the transitional parliament from power, hours after issuing a deadline for the assembly to dissolve itself. The warning from the commander of the al-Qaqa brigade added to turmoil in the OPEC producer where the government has struggled to rein in militias who helped topple Muammar Gaddafi in 2011. Picture taken February 18, 2014. REUTERS/Esam Omran Al-Fetori (LIBYA - Tags: CIVIL UNREST POLITICS) 

A Free Syrian Army fighter makes a hole in a wall during clashes in Aleppo August 12, 2012. REUTERS/Goran Tomasevic (SYRIA - Tags: CIVIL UNREST CONFLICT POLITICS) 

A rebel fighters fires an antiaircraft gun during an air strike in Ras Lanuf March 7, 2011.
Libya's army fought rebels for control of Ras Lanuf on Monday and a rebel official said Muammar Gaddafi could attack oilfields like a "wounded wolf" if the West did not stop him with air strikes. REUTERS/Goran Tomasevic (LIBYA - Tags: POLITICS CIVIL UNREST) 

Rebel fighters run for cover in front of an antiaircraft gun during an air strike in Ras Lanuf March 7, 2011.
Major Libyan oil ports Ras Lanuf and Brega in the east of the country are closed as violence in the area has hampered operations at the terminals, shipping sources said on Monday. REUTERS/Goran Tomasevic (LIBYA - Tags: POLITICS CIVIL UNREST) 

Tamil Tiger rebels stand next to a machine gun during military exercises in Kilnochchi, north of Sri Lanka, July 13, 2007. REUTERS/Anuruddha Lokuhapuarachchi (SRI LANKA) 

TO GO WITH STORY BC-COMMUNISTS-GERMANY-BUNKERS - Dietmar Arnold, a member of hobbyist explorers for World War Two bunkers views a World War Two two anti-aircraft in a Berlin bunker complex built by the Nazis October 26.

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FILE PHOTO 4MAR99 - Yugoslav army soldiers stand on duty at their anti-aircraft gun position some 90 km south-west of Pristina. The Yugoslav government declared a "state of immediate threat of war" March 23 with NATO poised to bomb the country over its refusal to accept a peace plan for Kosovo.

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Two Yugoslav army soldiers stand on duty at their anti-aircraft gun positions in the mountain near the border with Albania,some 90 km south-west of pristina March 4. The Yugoslav government said on Thursday it had decided to strengthen parts of its border to "prevent the infiltration of terrorists groups into Kosovo".

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