FireFlight UAS TwinHawk stands on the tarmac during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

FireFlight UAS unmanned aerial vehicles TwinHawk, Scout, Flanker, and Hawkeye 400, are displayed on the tarmac during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

The FireFlight UAS Flanker sits on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A pair of Griffon Aerospace Outlaw G2 stand on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A contractor looks inside a Griffon Aerospace Outlaw G2 during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A Griffon Aerospace Outlaw G2 lands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A General Atomics MQ-9 Reaper stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

Boeing Co. & Schiebel Industries' S-100 Camcopter stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

Boeing Co. & Schiebel Industries' S-100 Camcopter stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A General Atomics MQ-9 Reaper stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

An IRIS+ drone from 3D Robotics, referred to as "Hawkeye," stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

The Navmar Applied Sciences Corp. TigerShark flies during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

The Navmar Applied Sciences Corp. TigerShark is escorted off the runway after landing during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

The Navmar Applied Sciences Corp. TigerShark is escorted off the runway after landing during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon 

A General Atomics MQ-9 Reaper stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon TPX IMAGES OF THE DAY

A MQ-1B Predator Unmanned Aerial System vehicle that is part of Task Force Odin, stands inside a hangar at Bagram Air Field in the Parwan province of Afghanistan January 3, 2015. REUTERS/Lucas Jackson (AFGHANISTAN - Tags: CIVIL UNREST POLITICS MILITARY) 

A man walks past a graffiti, denouncing strikes by U.S. drones in Yemen, painted on a wall in Sanaa November 13, 2014. Yemeni authorities have paid out tens of thousands of dollars to victims of drone strikes using U.S.-supplied funds, a source close to Yemen's presidency said, echoing accounts by legal sources and a family that lost two members in a 2012 raid. REUTERS/Khaled Abdullah (YEMEN - Tags: CIVIL UNREST MILITARY POLITICS SOCIETY TPX IMAGES OF THE DAY) 

A Ukrainian serviceman operates a drone during a training session outside Kiev, November 6, 2014. Ukrainian volunteers organized an Unmanned Aerial Vehicle (UAV) operating course for servicemen serving in the military intelligence branch on the frontlines, according to organizers. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: MILITARY CIVIL UNREST CONFLICT) 

Belarussian border guards activate an unmanned aerial vehicle at their base near the border with Poland in Brest, November 5, 2014. As part of the Eastern Partnership Initiative, Belarus and Ukraine have implemented the program "SURKAP-1", to strengthen the green and water borders of these countries. In July this year they also started another project, "SURKAP-2", in Belarus which will be running for 30 months, according to local media. REUTERS/Vasily Fedosenko (BELARUS - Tags: SOCIETY MILITARY POLITICS) 

An unmanned aerial vehicle is pictured on a runway in front of the Federal Police during a media presentation at the airport in Iguala, in the southwestern state of Guerrero, October 31, 2014. According to the police, the drone will be used to help in the search for 43 missing student teachers, who disappeared last month and are feared massacred in Iguala. REUTERS/Henry Romero (MEXICO - Tags: CIVIL UNREST CRIME LAW MILITARY) 

A member of the Organisation for Security and Cooperation in Europe's (OSCE) takes part in a demonstration test launching of a drone aircraft, which is expected to observe the situation in eastern regions of Ukraine, near the southern coastal town of Mariupol, October 23, 2014. REUTERS/Nikolai Ryabchenko (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT) 

A U.S.-led coalition unmanned aerial vehicle flying over Kobani is pictured from Suruc in Sanliurfa province, October 13, 2014. Three Islamic State fighters blew themselves up on Monday in Kobani near the Turkish border with Syria, a monitoring group said, with the hardline militants making slight advances inside the besieged Kurdish town. REUTERS/Umit Bektas (TURKEY - Tags: MILITARY CONFLICT POLITICS) 

Lebanese Army soldiers carry parts of an Israeli drone in the Marjeyoun countryside, south Lebanon September 20, 2014. The Lebanese Army found the MK drone that fell in the Marjeyoun countryside near the Lebanese-Israeli border, the National News Agency (NNA) reported. The Israel Defence Forces confirmed that the unmanned aerial vehicle was from Israel, according to Israeli media. REUTERS/Karamallha Daher (LEBANON - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY) 

An Israeli soldier launches a Skylark unmanned aerial vehicle near the border with Gaza July 21, 2014. Israeli forces killed 10 Palestinian militants who slipped across the border from Gaza through hidden tunnels on Monday, the military said, as the death toll from the two-week conflict passed 500 amid growing international calls for an end. Non-stop attacks lifted the Palestinian death toll to 496, including almost 100 children, since fighting started on July 8, Gaza health officials said. Israel says 18 of its soldiers have also died along with two civilians. REUTERS/Ronen Zvulun (ISRAEL - Tags: MILITARY CONFLICT CIVIL UNREST POLITICS) 

An Israeli soldier launches a Skylark unmanned aerial vehicle near the Israeli-Gaza Border July 16, 2014. Israel on Wednesday agreed to a proposed six-hour cessation of hostilities in the Gaza Strip for humanitarian reasons, a Israeli senior official told Reuters. The official, speaking on condition of anonymity, said it had not yet been decided when the lull would take place. Hamas had no immediate comment. REUTERS/Baz Ratner (ISRAEL - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY) 

Nine-year-old Palestinian girl Maryam Al-Masri, who hospital officials said was wounded in an Israeli air strike, listens to her grandmother as she lies on a bed while receiving treatment at a hospital in Gaza City July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. More than 166 Palestinians, most of them civilians, have been killed, Gaza health officials said, in seven days of fighting that has shown no sign of ending. Israel says its offensive is intended to halt rocket fire at its cities from the Gaza Strip. REUTERS/Mohammed Salem (GAZA - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Four-year-old Palestinian girl Shayma Al-Masri, who hospital officials said was wounded in an Israeli air strike that killed her mother and two of her siblings, lies on a bed next to her doll as she receives treatment at a hospital in Gaza City July 14, 2014. The girl and her father were the only survivors left in the family. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. More than 166 Palestinians, most of them civilians, have been killed, Gaza health officials said, in seven days of fighting that has shown no sign of ending. Israel says its offensive is intended to halt rocket fire at its cities from the Gaza Strip.
REUTERS/Mohammed Salem (GAZA - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A relative of three Palestinian members of Abu Muamar family, who hospital officials said were killed in an Israeli air strike on their house, looks out of a window as she mourns during their funeral in Rafah in the southern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. More than 166 Palestinians, most of them civilians, have been killed, Gaza health officials said, in seven days of fighting that has shown no sign of ending. Israel says its offensive is intended to halt rocket fire at its cities from the Gaza Strip. REUTERS/Ibraheem Abu Mustafa (GAZA) 

An Israeli soldier stands in front of the barrel of a tank at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

Israeli soldiers sit atop an armoured personnel carrier (APC) at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

An Israeli soldier checks the barrel of a tank at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

An Israeli soldier adjusts the barrel of a tank at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

An Israeli soldier brushes his teeth at a military staging area outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

Israeli soldiers clean the barrel of a mobile artillery unit outside central Gaza July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY RELIGION) 

Israeli soldiers dance with members of the Breslov Hasidic sect at a military staging area outside central Gaza July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY RELIGION) 

Israeli soldiers dance with members of the Breslov Hasidic sect at a military staging area outside central Gaza July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY RELIGION) 

Israeli soldiers stand atop a tank outside the northern Gaza Strip July 14, 2014. Israel said it shot down a drone from Gaza a week into its offensive on Monday, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST MILITARY) 

A soldier walks toward a model plane, which one marine said was used by the South Korean army for target practice, on a beach on Yeonpyeong island, which lies just inside the South Korean side of the Northern Limit Line (NLL) in the Yellow Sea April 8, 2014. An unmanned drone crashed on a South Korean island near a disputed maritime border with North Korea, a South Korean defence ministry official said on April 1, triggering an investigation into whether the aircraft was from the North. The Northern Limit Line, a disputed maritime border that wraps itself round a part of the North's coastline, has been the scene of frequent clashes between South and North Korea. The line was drawn up at the end of the 1950-53 Korean War and North Korea does not recognize it. The two sides are still technically at war as the conflict ended in a mere truce, not a treaty. Picture taken April 8, 2014. REUTERS/Damir Sagolj (SOUTH KOREA - Tags: MILITARY SOCIETY POLITICS)

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A South Korean P3 Orion aircraft takes off from the Royal Australian Air Force (RAAF) Pearce Airbase, near Perth, as it participates in the continuing search for the missing Malaysian Airlines flight MH370 over the southern Indian Ocean April 17, 2014. The "Bluefin-21" deep-sea drone had completed its much-anticipated first full scan of the seabed in the remote Indian Ocean, the team looking for the missing Malaysian jetliner said on Thursday, as an air and surface search became less likely to yield results. Footage from the U.S. Navy deep-sea drone is fast becoming the most important tool for a multinational team still searching for Malaysia Airlines flight MH370, which disappeared from radar screens on March 8 with 239 people aboard. REUTERS/Greg Wood/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER TPX IMAGES OF THE DAY) 

A Chinese Ilyushin IL -76s aircraft lands at Perth International Airport after flying over the southern Indian Ocean as part of the continuing search for the missing Malaysian Airlines flight MH370 April 17, 2014. The Bluefin-21 deep-sea drone had completed its much-anticipated first full scan of the seabed in the remote Indian Ocean, the team looking for the missing Malaysian jetliner said on Thursday, as an air and surface search became less likely to yield results.
Footage from the U.S. Navy deep-sea drone is fast becoming the most important tool for a multinational team still searching for Malaysia Airlines flight MH370, which disappeared from radar screens on March 8 with 239 people aboard. REUTERS/Rob Griffiths/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER) 

A Chinese Ilyushin IL-76 aircraft lands at Perth International Airport, after participating in the continuing search in the southern Indian Ocean for the missing Malaysian Airlines flight MH370, April 16, 2014. The search for a Malaysia Airlines jetliner deep in the Indian Ocean was again cut short on Wednesday when technical problems forced a U.S. Navy underwater drone to surface without finding anything, officials said. While a massive air and sea search for missing Malaysian Airlines flight MH370 is continuing almost 2,000 km (1,200 miles) off the coast of Perth, hopes have been pinned on the Bluefin-21 autonomous underwater vehicle finding the first concrete sign of the plane in more than six weeks of hunting.REUTERS/Richard Wainwright/Pool (AUSTRALIA - Tags: TRANSPORT MILITARY DISASTER) 

A Chinese Ilyushin IL-76 aircraft prepares to fly out from Perth International Airport, to participate in the continuing search in the southern Indian Ocean for the missing Malaysian Airlines flight MH370, April 16, 2014. The search for a Malaysia Airlines jetliner deep in the Indian Ocean was again cut short on Wednesday when technical problems forced a U.S. Navy underwater drone to surface without finding anything, officials said. While a massive air and sea search for missing Malaysian Airlines flight MH370 is continuing almost 2,000 km (1,200 miles) off the coast of Perth, hopes have been pinned on the Bluefin-21 autonomous underwater vehicle finding the first concrete sign of the plane in more than six weeks of hunting. REUTERS/Greg Wood/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER) 

A U.S. Navy P-8 Poseidon aircraft takes off from Perth International Airport to participate in the continuing search in the southern Indian Ocean for the missing Malaysian Airlines flight MH370, April 16, 2014. The search for a Malaysia Airlines jetliner deep in the Indian Ocean was again cut short on Wednesday when technical problems forced a U.S. Navy underwater drone to surface without finding anything, officials said. While a massive air and sea search for missing Malaysian Airlines flight MH370 is continuing almost 2,000 km (1,200 miles) off the coast of Perth, hopes have been pinned on the Bluefin-21 autonomous underwater vehicle finding the first concrete sign of the plane in more than six weeks of hunting. REUTERS/Greg Wood/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER) 

A Chinese Ilyushin IL-76 aircraft lands at Perth International Airport April 16, 2014, after participating in the continuing search in the southern Indian Ocean for the missing Malaysian Airlines flight MH370. The search for a Malaysia Airlines jetliner deep in the Indian Ocean was again cut short on Wednesday when technical problems forced a U.S. Navy underwater drone to surface without finding anything, officials said. While a massive air and sea search for missing Malaysian Airlines flight MH370 is continuing almost 2,000 km (1,200 miles) off the coast of Perth, hopes have been pinned on the Bluefin-21 autonomous underwater vehicle finding the first concrete sign of the plane in more than six weeks of hunting. REUTERS/Greg Wood/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER) 

Free Syrian Army fighters fly a remote-controlled miniature aircraft with a camera attached -- a device the fighters say is used to spy on forces loyal to Syria's President Bashar al-Assad, in the rebel-controlled Mleha in the suburb of Damascus April 11, 2014. Picture taken April 11, 2014. REUTERS/Yaseen al-Bushy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

An unmanned remote-controlled miniature aircraft with an attached camera, which rebels say belonged to forces loyal to Syria's President Bashar al-Assad, is seen inside a room in Homs, November 11, 2013. Free Syrian Army fighters claimed that they brought down the remote-controlled miniature aircraft by frequency interference. Picture taken November 11, 2013. REUTERS/Yazan Homsy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

A protester wears a mask depicting a skull beneath the head of the Statue of Liberty, as he demonstrates beneath a model of a U.S. drone aircraft during the "Stop Watching Us: A Rally Against Mass Surveillance" near the U.S. Capitol in Washington, October 26, 2013. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS MILITARY CIVIL UNREST) 

Demonstrators deploy a model of a U.S. drone aircraft at the "Stop Watching Us: A Rally Against Mass Surveillance" near the U.S. Capitol in Washington, October 26, 2013. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS MILITARY CIVIL UNREST TPX IMAGES OF THE DAY) 

Demonstrators deploy a model of a U.S. drone aircraft at the "Stop Watching Us: A Rally Against Mass Surveillance" near the U.S. Capitol in Washington, October 26, 2013. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS MILITARY CIVIL UNREST) 

A 'Hunter' Unmanned Aerial System's controller is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. Drone has a wing-spread of 10.44 metre, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY) 

A 'Hunter' Unmanned Aerial System's controller is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. Drone has a wing-spread of 10.44 metre, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANYMILITARY - Tags: POLITICS) MILITARY) 

A 'Hunter' Unmanned Aerial System is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. Drone has a wing-spread of 10.44 metre, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANYMILITARY - Tags: POLITICS) MILITARY) 

Soldiers stand behind of a camera by Unmanned Aerial System 'Hunter' during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. Drone has a wing-spread of 10.44 metre, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANYMILITARY - Tags: POLITICS) MILITARY) 

Soldiers stand behind of a camera by Unmanned Aerial System 'Shadow' during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. The drone has a wing-spread of 6.90 metre, an aircraft speed of about 177 km/h and it's mainly used in Afghanistan. Picture taken October 8. REUTERS/Michaela Rehle (GERMANYMILITARY - Tags: POLITICS) MILITARY) 

A soldier stands in front of a 'Shadow' Unmanned Aerial System during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. The drone has a wing-spread of 6.90 metre, an aircraft speed of about 177 km/h and it's mainly used in Afghanistan. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY TPX IMAGES OF THE DAY) 

A 'Hunter' Unmanned Aerial System is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. The drone has a wing-spread of 10.44 metres, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY) 

A 'Hunter' Unmanned Aerial System is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. The drone has a wing-spread of 10.44 metres, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY) 

A 'Hunter' Unmanned Aerial System is displayed during an official presentation by the German and U.S. Unmanned Aerial Systems (UAS) at the U.S. military base in Vilseck-Grafenwoehr October 8, 2013. The drone has a wing-spread of 10.44 metres, an aircraft speed of about 185 km/h and was used first time 1999 in Kosovo. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY)