A view of a uniform patch of a NATO soldier inside the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A view of the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A view of a uniform patch of a NATO soldier inside the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A view of the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

Soldiers sit inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg gets off a Boeing AWACS reconnaissance plane during a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg speaks at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur speak at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur attend a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur shake hands at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur shake hands at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

President of Boeing International Michael Arthur speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

The door of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

The rotodome of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

A part of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

NATO Secretary General Jens Stoltenberg speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron 

Prime Minister Hubert MInnis boards a U.S. Coast Guard plane, en route to Abaco for a reconnaissance flight to survey damage caused by Hurricane Dorian, in Nassau, Bahamas, September 3, 2019. REUTERS/John Marc Nutt MANDATORY CREDIT. 

A tail of the WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron bears the name "Hurricane Hunters" as the plane awaits its departure from Keesler Air Force Base in Biloxi, Mississippi to fly into the eye of Hurricane Irma off the coast of southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

A tail of the WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron bears the name "Hurricane Hunters" as the plane awaits its departure from Keesler Air Force Base in Biloxi, Mississippi to fly into the eye of Hurricane Irma off the coast of southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

An onboard screen shows the WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron known as the "Hurricane Hunters" as it flies through the eye of Hurricane Irma as the storm approaches the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

As nightfall approaches, a WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron known as the "Hurricane Hunters" flies through the eye of Hurricane Irma as it approaches the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

As night falls, the eyewall of Hurricane Irma is seen from a WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron know as the "Hurricane Hunters" as the storm nears the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

A U.S. Air Force Reserves officer from the 53rd Weather Reconnaissance Squadron know as the "Hurricane Hunters" shows the inner workings of a dropsonde, a device dropped from planes to monitor meteorological data in a hurricane, at Keesler Air Force Base in Biloxi, Mississippi, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

U.S. Air Force reserve citizen airman Staff Sgt. Nicholas Monteleone speaks on the phone beside a painting of planes flying through a hurricane at Keesler Air Force Base, home of the 53rd Weather Reconnaissance Squadron know as "Hurricane Hunters" in Biloxi, Mississippi, hours before taking off in a WC-130J Super Hercules to fly into the eye of Hurricane Irma off southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

A WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron know as "Hurricane Hunters" is readied for take off from Keesler Air Force Base in Biloxi, Mississippi to fly into the eye of Hurricane Irma off the coast of southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

U.S. Air Force Reserve Technical Sgt. Karen Moore (L) and Major Nicole Mitchell look at a dropsonde, a device dropped from planes to monitor meteorological data in a hurricane, aboard a WC-130J Super Hercules from the 53rd Weather Reconnaissance Squadron know as the "Hurricane Hunters" en route to the eye of Hurricane Irma as the storm nears the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

A WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron known as the "Hurricane Hunters" approaches Hurricane Irma as the storm makes its way toward the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque 

Philippine Defence Secretary Delfin Lorenzana disembarks from the cockpit of a Cessna-208B Grand Caravan Intelligence, Surveillance and Reconnaissance (ISR) aircraft acquired by the Philippine government from the U.S. during a turn over ceremony at the Philippine Air Force (PAF) headquarters in Manila, Philippines July 27, 2017. REUTERS/Dondi Tawatao 

U.S. Ambassador to the Philippines Sung Kim poses at the cockpit of a Cessna-208B Grand Caravan Intelligence, Surveillance and Reconnaissance (ISR) aircraft acquired by the Philippine government from the U.S. during a turn over ceremony at the Philippine Air Force (PAF) headquarters in Manila, Philippines July 27, 2017. REUTERS/Dondi Tawatao 

U.S. Ambassador to the Philippines Sung Kim pours wine on a Cessna-208B Grand Caravan Intelligence, Surveillance and Reconnaissance (ISR) aircraft acquired by the Philippine government from the U.S. during a turn over ceremony at the Philippine Air Force (PAF) headquarters in Manila, Philippines July 27, 2017. REUTERS/Dondi Tawatao 

German Defence Minister Ursula von der Leyen leaves a helicopter during her visit of the 13th reconnaissance battalion in Gotha, Germany, August 9, 2016. REUTERS/Ralph Orlowski 

Indonesian airforce personnel tidy up their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. REUTERS/Edgar Su

Indonesian airforce personnel stand next to their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. REUTERS/Edgar Su

German air force Tornado jets and a cargo aircraft approach to land at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas 

German air force Tornado jets and a cargo aircraft approach to land at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

German air force Tornado jets approach to land at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas 

A German air force Tornado jet approaches to land at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas 

A German airforce Airbus A400M military refuelling aircraft approaches to land at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas 

A German airforce Airbus A400M military refuelling aircraft flies past a minoret shortly before the landing at an airbase in Incirlik, Turkey, December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer TPX IMAGES OF THE DAY 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer 

A German air force Tornado jet takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first of the German air force Tornado reconnaissance jets took off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer TPX IMAGES OF THE DAY 

A German airforce Airbus A400M military aircraft takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

Army personnel board a German airforce Airbus A400M military aircraft at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

Army personnel board a German airforce Airbus A400M military aircraft at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military refuelling aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey?s Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer ( - Tags: TRANSPORT MILITARY) 

A German airforce Airbus A400M military refuelling aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey?s Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer ( - Tags: TRANSPORT MILITARY) 

Britain's Prime Minister David Cameron (6th L) speaks with military personnel as he stands between an RAF Sentinel surveillance aircraft (L) and an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

French National Front party deputy Marion Marechal-Le Pen arrives as French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer 

French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY