Alla Kharchenko, the mother of Ukrainian soldier Zviryk Valentyn who was killed by an antitank mine during a reconnaissance mission in the Kharkiv region, is consoled by family and friends outside Valentyn's home in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

Friends and family wait to bid farewell to Ukrainian soldier Zviryk Valentyn, who was killed by an antitank mine during a reconnaissance mission in the Kharkiv region, outside Valentyn's home in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

A soldier pays his respects to fellow soldier Zviryk Valentyn, who was killed by an antitank mine during a reconnaissance mission in the Kharkiv region, at a cemetery in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

Family members of Ukrainian soldier Zviryk Valentyn, who was killed by an antitank mine during a reconnaissance mission in the Kharkiv region, attend his funeral service at a church in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

Alla Kharchenko, the mother of Ukrainian soldier Zviryk Valentyn who was killed by an antitank mine during a reconnaissance mission in Kharkiv region, weeps next to her son's coffin outside his home in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

Alla Kharchenko, the mother of Ukrainian soldier Zviryk Valentyn who was killed by an antitank mine during a reconnaissance mission in Kharkiv region, touches a portrait of her son during a farewell tribute outside his home in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

A priest looks on as the body of Ukrainian soldier Zviryk Valentyn, who was killed by an antitank mine during a reconnaissance mission in Kharkiv region, is brought to a church in Kyiv, Ukraine June 2, 2022. REUTERS/Edgar Su 

Soldiers don a prototype of the U.S. Army?s Integrated Visual Augmentation System (IVAS) during a Soldier Touchpoint 3 (STP 3) squad reconnaissance mission test training event at Fort Pickett, Virginia, U.S., October 21, 2020. Picture taken October 21, 2020. Courtney Bacon/U.S. Army via REUTERS 

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 

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 Reserves Colonel Jim Hitterman places his hands over a briefing guide for the Air Force's 53rd Weather Reconnaissance Squadron know as "Hurricane Hunters" at Keesler Air Force Base in Biloxi, Mississippi before taking off 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 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 mission document for the Air Force's 53rd Weather Reconnaissance Squadron know as "Hurricane Hunters" sits on the table during a crew briefing at Keesler Air Force Base in Biloxi, Mississippi before taking off 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 

The United Launch Alliance (ULA) Atlas V 541 launches the NROL-35 mission for the National Reconnaissance Office (NRO) at the Vandenberg Air Force Base in California December 12, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: POLITICS SCIENCE TECHNOLOGY SOCIETY TPX IMAGES OF THE DAY) 

The United Launch Alliance (ULA) Atlas V 541 launches the NROL-35 mission for the National Reconnaissance Office (NRO) at the Vandenberg Air Force Base in California December 12, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: POLITICS SCIENCE TECHNOLOGY SOCIETY TPX IMAGES OF THE DAY) 

The United Launch Alliance (ULA) Atlas V 541 launches the NROL-35 mission for the National Reconnaissance Office (NRO) at the Vandenberg Air Force Base in California December 12, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: POLITICS SCIENCE TECHNOLOGY SOCIETY) 

A NATO AWACS (Airborne Warning and Control Systems) aircraft is seen on the tarmac as it prepares to take-off for a training mission from the AWACS air base in Geilenkirchen near the German-Dutch border April 16, 2014. NATO said on Wednesday it would send more ships, planes and troops to eastern Europe to reassure allies worried by Russia's annexation of Crimea but shied away from new permanent bases in the east as Poland wanted. REUTERS/Francois Lenoir (GERMANY - Tags: POLITICS MILITARY TRANSPORT TPX IMAGES OF THE DAY) 

A Free Army fighter walks in a field of flowers during a reconnaissance mission on the Heesh front, for what they said was an operation to take over a checkpoint belonging to the regime's forces, at the countryside in Idlib April 10, 2014. Picture taken April 10, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

Free Army fighters walk in a field of flowers during a reconnaissance mission on the Heesh front, for what they said was an operation to take over a checkpoint belonging to the regime's forces, at the countryside in Idlib April 10, 2014. Picture taken April 10, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

Free Army fighters walk in a field of flowers during a reconnaissance mission on the Heesh front, for what they said was an operation to take over a checkpoint belonging to the regime's forces, at the countryside in Idlib April 10, 2014. Picture taken April 10, 2014. REUTERS/Khalil Ashawi (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT) 

A German Bundeswehr armed forces pilot operator (L) and an aerial vehicle operator control a Heron 1 unmanned aerial vehicle (UAV) on a mission, from their Advance Ground Control Station at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

A German Bundeswehr armed forces pilot operator controls a Heron 1 unmanned aerial vehicle (UAV) on a mission from their Advance Ground Control Station at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

A German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) takes off for a mission from the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

A German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) is wheeled out from an aircraft hanger before taking off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

Jennifer Trosper, Mars Science Laboratory (MSL) mission manager, speaks as an enlarged image taken by NASA's Mars Reconnaissance orbiter of NASA's Mars science rover Curiosity's heat shield after it was jettisoned is projected on a video screen during a news conference at NASA's Jet Propulsion Laboratory in Pasadena, California August 6, 2012. NASA's Mars science rover Curiosity performed a daredevil descent through pink Martian skies late on Sunday to clinch an historic landing inside an ancient crater, ready to search for signs the Red Planet may once have harbored key ingredients for life. REUTERS/Fred Prouser (UNITED STATES - Tags: SCIENCE TECHNOLOGY) 

Two Canadian Armed Forces CH-146 Griffon helicopters fly down the runway at 408 squadron in Edmonton, Alberta, May 20, 2011. In service in Canada since 1995, the Griffon is used at home and abroad for search and rescue missions, surveillance and reconnaissance, casualty evacuation and has been used in Afghanistan. REUTERS/Todd Korol (CANADA - Tags: TRANSPORT MILITARY) 

German Chancellor Angela Merkel arrives to address the media in Berlin, March 18, 2011. Germany is in talks with the NATO alliance on whether it could take on extra AWACS aerial reconnaissance missions in Afghanistan, Merkel said on Friday. Germany abstained from voting for a U.N. Security Council resolution authorising a no-fly zone over Libya because of worries there would be civilian victims like in Iraq and
Afghanistan. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS) 

German Chancellor Angela Merkel addresses the media in Berlin, March 18, 2011. Germany is in talks with the NATO alliance on whether it could take on extra AWACS aerial reconnaissance missions in Afghanistan, Merkel said on Friday. Germany abstained from voting for a U.N. Security Council resolution authorising a no-fly zone over Libya because of worries there would be civilian victims like in Iraq and
Afghanistan. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS) 

German Chancellor Angela Merkel addresses the media in Berlin, March 18, 2011. Germany is in talks with the NATO alliance on whether it could take on extra AWACS aerial reconnaissance missions in Afghanistan, Merkel said on Friday. Germany abstained from voting for a U.N. Security Council resolution authorising a no-fly zone over Libya because of worries there would be civilian victims like in Iraq and
Afghanistan. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS) 

German Chancellor Angela Merkel addresses the media in Berlin, March 18, 2011. Germany is in talks with the NATO alliance on whether it could take on extra AWACS aerial reconnaissance missions in Afghanistan, Merkel said on Friday. Germany abstained from voting for a U.N. Security Council resolution authorising a no-fly zone over Libya because of worries there would be civilian victims like in Iraq and
Afghanistan. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS IMAGES OF THE DAY HEADSHOT) 

German Chancellor Angela Merkel addresses the media in Berlin, March 18, 2011. Germany is in talks with the NATO alliance on whether it could take on extra AWACS aerial reconnaissance missions in Afghanistan, Merkel said on Friday. Germany abstained from voting for a U.N. Security Council resolution authorising a no-fly zone over Libya because of worries there would be civilian victims like in Iraq and
Afghanistan. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS IMAGES OF THE DAY HEADSHOT) 

Soldiers of the reconnaissance squadron 51 'Immelmann' stand in row during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Tuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

Tornado jet fighter plane of the reconnaissance squadron 51 'Immelmann' prepares for landing at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY) 

German airforce Chief of Staff Aarne Kreuzinger-Janik salutes during a welcome ceremony for a Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS HEADSHOT) 

German airforce Chief of Staff Aarne Kreuzinger-Janik salutes during a welcome ceremony for a Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS HEADSHOT) 

German airforce Chief of Staff Aarne Kreuzinger-Janik salutes during a welcome ceremony for a Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS HEADSHOT) 

Soldiers of the reconnaissance squadron 51 'Immelmann' stand in row during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

Soldiers of the reconnaissance squadron 51 'Immelmann' stand in row during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

Members of an honour guard stand still during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg (3rd R), German air force Chief of Staff Aarne Kreuzinger-Janik (2nd R), Karsten Stoye (R), commodore of the reconnaissance squadron 51 'Immelmann', and squad members (L) salute during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

Tornado jet fighter planes of the reconnaissance squadron 51 'Immelmann' stand on the runway upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

Tornado jet fighter planes of the reconnaissance squadron 51 'Immelmann' taxi on the runway upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY) 

Tornado jet fighter planes of the reconnaissance squadron 51 'Immelmann' taxi on the runway upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg speaks to journalists during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Tuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS HEADSHOT) 

German Defence Minister Karl-Theodor zu Guttenberg attends a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Tuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg (L) speaks with Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg (2nd R) speaks to Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg speaks to soldiers and guests beside German air force Chief of Staff Aarne Kreuzinger-Janik (2nd L) and Karsten Stoye (L), commodore of the reconnaissance squadron 51 'Immelmann', during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg speaks to soldiers and guests during a welcome ceremony for Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Tuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg and other officials welcome Tornado jet fighter of the reconnaissance squadron 51 'Immelmann' upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Thuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

German Defence Minister Karl-Theodor zu Guttenberg (3rd R), German air force Chief of Staff Aarne Kreuzinger-Janik (2nd R) and Karsten Stoye (R), commodore of the reconnaissance squadron 51 'Immelmann', welcome Tornado jet fighter crew of the reconnaissance squadron 51 'Immelmann' upon arrival at Schleswig airbase in Jagel near the German-Danish border November 30, 2010. The six Tornado jets with reconnaissance equipment returned on Tuesday from their ISAF mission in Afghanistan. REUTERS/Christian Charisius (GERMANY - Tags: MILITARY POLITICS) 

U.S. marines from First Light Armoured Reconnaissance Battalion hold a briefing before departing for a mission from remote U.S. military Combat Outpost Castle in Helmand, Afghanistan September 6, 2010. REUTERS/Erik de Castro (AFGHANISTAN) 

U.S. Marines from First Light Armoured Reconnaissance unit prepare to leave Combat Outpost Payne aboard armoured vehicles for a mission in Helmand September 6, 2010. REUTERS/Erik de Castro (AFGHANISTAN - Tags: MILITARY CONFLICT) 

U.S. Marines from First Light Armoured Reconnaissance unit leaves Combat Outpost Payne aboard an armoured vehicle for a mission in Helmand September 6, 2010. REUTERS/Erik de Castro (AFGHANISTAN - Tags: MILITARY CONFLICT) 

U.S. Marines from First Light Armoured Reconnaissance unit leave Combat Outpost Payne aboard armoured vehicles for a mission in Helmand September 6, 2010. REUTERS/Erik de Castro (AFGHANISTAN - Tags: MILITARY CONFLICT IMAGES OF THE DAY) 

Members of the 11th Reconnaissance Squadron from Indian Springs, Nev., perform pre-flight checks on the Predator unmanned aerial vehicle prior to a mission, in this November 9, 2001 file photo shot at an undisclosed location. In the rugged mountains of western Pakistan, missiles launched by unmanned Predator or Reaper drones have become so commonplace that some U.S counterterrorism officials liken them to "cannon fire." To match Special Report USA-PAKISTAN-DRONES REUTERS/U.S. Air Force/Handout/Files (UNITED STATES - Tags: MILITARY)