Question: What field of work do both Gerhard Thiele and Léopold Eyharts have in common?

full_context: Document 1: Patrick Baudry: Patrick Pierre Roger Baudry (born March 6, 1946 in Cameroon), is a retired Lieutenant Colonel in the French Air Force and a former CNES astronaut. In 1985, he became the second French citizen in space, after Jean-Loup Chrétien, when he flew aboard NASA's Space Shuttle mission STS-51-G.
Document 2: Hans Schlegel: Hans Wilhelm Schlegel (Überlingen, 3 August 1951) is a German physicist, an ESA astronaut, and a veteran of two NASA Space Shuttle missions.
Document 3: Thomas Reiter: Thomas Arthur Reiter (born 23 May 1958 in Frankfurt, West Germany) is a retired European astronaut and is a Brigadier General in the German Air Force currently working as ESA Interagency Coordinator and Advisor to the Director General at the European Space Agency (ESA). He was one of the top 25 astronauts in terms of total time in space. With his wife and two sons he lives near Oldenburg in Lower Saxony.
Document 4: Sigmund Jähn: Sigmund Werner Paul Jähn (born 13 February 1937) is a German cosmonaut and pilot, who in 1978 became the first East German (and German native) to fly in space as part of the Soviet Union's Interkosmos programme.
Document 5: Astronaute Club Européen: The Astronaute Club Européen or ACE, is a French association created on December 3, 2005 (decree of the "Journal Officiel" n°20050049), by Jean-Pierre Haigneré (cosmonaut), Laurent Gathier (director of space activities of Dassault Aviation and space pioneer) and Alain Dupas (Physicist, head of mission at CNES); and whose headquarters are located in the rooms of the Aéroclub de France in Paris.
Document 6: Jean-Pierre Haigneré: Jean-Pierre Haigneré (born 19 May 1948) is a French Air Force officer and a former CNES spationaut.
Document 7: European Astronaut Corps: The European Astronaut Corps is a unit of the European Space Agency (ESA) that selects, trains, and provides astronauts as crew members on U.S. and Russian space missions. As of Nov 2014, 24 ESA astronauts are now able to go board the ISS. There are currently 47 members of the Corps, 26 currently active. The European Astronaut Corps is based at the European Astronaut Centre in Cologne, Germany. They can be assigned to various projects both in Europe (at ESTEC, for instance) or elsewhere in the world, at NASA Johnson Space Center or Star City.
Document 8: Philippe Perrin: Philippe Perrin (Colonel, French Air Force) (born January 6, 1963) is a French test pilot and former CNES and European Space Agency astronaut.
Document 9: Léopold Eyharts: Léopold Eyharts (born April 28, 1957) is a Brigadier General in the French Air Force, an engineer and ESA astronaut.
Document 10: Gerhard Schwehm: Gerhard Schwehm (b. 13 March 1949, Ludwigshafen am Rhein, Germany) is Head of Solar System Science Operations Division for the European Space Agency (ESA). He was Mission Manager for the Rosetta mission until his retirement.
Document 11: Gerhard Thiele: Dr. Gerhard Paul Julius Thiele (born September 2, 1953) is a German physicist and a former ESA astronaut.
Document 12: Claudie Haigneré: Claudie (André-Deshays) Haigneré (born 13 May 1957) is a French doctor, politician, and former astronaut with the Centre National d'Études Spatiales (1985–1999) and the European Space Agency (1999–2002).
Document 13: Ulf Merbold: Dr. Ulf Dietrich Merbold (born June 20, 1941) is the first West German citizen and second German native (after Sigmund Jähn) to have flown in space. He is also the first member of the European Space Agency Astronaut Corps to participate in a spaceflight mission and the first non-US citizen to reach orbit in a US spacecraft. In 1983, he and Byron Lichtenberg became the first Payload Specialists to fly on the shuttle.
Document 14: Hermann Oberth: Hermann Julius Oberth (] ; 25 June 1894 – 28 December 1989) was an Austro-Hungarian-born German physicist and engineer. He is considered one of the founding fathers of rocketry and astronautics, along with the French Robert Esnault-Pelterie, the Russian Konstantin Tsiolkovsky and the American Robert Goddard.
Document 15: Jean-François Clervoy: Jean-François André Clervoy (born 19 November 1958) is a French engineer and a CNES and ESA astronaut. He is a veteran of three NASA Space Shuttle missions.
ground_truth: ESA astronaut