Gemini 4 (officially Gemini IV) was the second manned space flight in NASA's Project Gemini, occurring in June 1965.
 It was the tenth manned American spaceflight (including two X-15 flights at altitudes exceeding 100 km ).
 Astronauts James McDivitt and Edward H. White, II circled the Earth 66 times in four days, making it the first US flight to approach the five-day flight of the Soviet Vostok 5.
 The highlight of the mission was the first space walk by an American, during which White floated free outside the spacecraft, tethered to it, for approximately 20 minutes.
 Both of these accomplishments helped the United States overcome the Soviet Union's early lead in the Space Race.
Soyuz 5 (Russian: Союз 5 , "Union 5") was a Soyuz mission using the Soyuz 7K-OK spacecraft launched by the Soviet Union on 15 January 1969, which docked with Soyuz 4 in orbit.
 It was the first-ever docking of two manned spacecraft of any nation, and the first-ever transfer of crew from one space vehicle to another of any nation, the only time a transfer was accomplished with a space walk – two months before the US Apollo 9 mission performed the first ever internal crew transfer.
The Soviet space program (Russian: Космическая программа СССР, "Kosmicheskaya programma SSSR") comprised the rocketry and space exploration programs conducted by the former Soviet Union (USSR) from the 1930s until its dissolution in 1991.
 Over its sixty-year history, this primarily classified military program was responsible for a number of pioneering accomplishments in space flight, including the first intercontinental ballistic missile (R-7), first satellite (Sputnik 1), first animal in Earth orbit (the dog Laika on Sputnik 2), first human in space and Earth orbit (cosmonaut Yuri Gagarin on Vostok 1), first woman in space and Earth orbit (cosmonaut Valentina Tereshkova on Vostok 6), first spacewalk (cosmonaut Alexey Leonov on Voskhod 2), first Moon impact ("Luna 2"), first image of the far side of the moon ("Luna 3") and unmanned lunar soft landing ("Luna 9"), first space rover ("Lunokhod 1"), first sample of lunar soil automatically extracted and brought to Earth ("Luna 16"), and first space station (Salyut 1).
 Further notable records included the first interplanetary probes: Venera 1 and Mars 1 to fly by Venus and Mars, respectively, Venera 3 and Mars 2 to impact the respective planet surface, and Venera 7 and Mars 3 to make soft landings on these planets.
Zond 3 was a 1965 space probe intended to be sent toward Mars as a spacecraft test.
 It was a member of the Soviet Zond program sharing designation Zond, while being part of Mars 3MV project.
 It was unrelated to Zond spacecraft designed for manned circumlunar mission (Soyuz 7K-L1).
 Zond 3 completed a successful Lunar flyby, taking a number of good quality photographs for its time.
 It is believed that Zond 3 was initially designed as a companion spacecraft to Zond 2 to be launched to Mars during the 1964 launch window.
 The opportunity to launch was missed, and the spacecraft was launched on a Mars trajectory as a spacecraft test, even though Mars was no longer attainable.
The Age of Pioneers (Russian: Время первых , "Vremya Pervykh " , lit.
 "Time of the first ones"), also known as Spacewalk, is a Russian historical drama film about cosmonaut Alexey Leonov, the first human to perform a spacewalk.
 Leonov himself served as a consultant for the film.
 "The Age of Pioneers" was directed by Dmitriy Kiselev and co-produced by Timur Bekmambetov and Yevgeny Mironov, the latter also starred in the leading role.
Alexey Arkhipovich Leonov (Russian: Алексе́й Архи́пович Лео́нов ; ] ; born 30 May 1934 in Listvyanka, West Siberian Krai, Soviet Union) is a retired Soviet/Russian cosmonaut, Air Force Major general, writer and artist.
 On 18 March 1965, he became the first human to conduct extravehicular activity (EVA), exiting the capsule during the Voskhod 2 mission for a 12-minute spacewalk.
Pierre Joseph Thuot ( ; born May 19, 1955) is a retired United States Navy Captain and NASA astronaut.
 He went into space three times, spending over 650 hours in space, including over 15 hours in three space walks.
 He is a former U.S. record holder for time spent on one space walk, and participated in the first three-person space walk.
Into That Silent Sea: Trailblazers of the Space Era 1961–1965 is a 2007 non-fiction book by space historians Francis French and Colin Burgess.
 Drawing on a number of original personal interviews with astronauts, cosmonauts and those who worked closely with them, the book chronicles the American and Russian programs from 1961 onwards, from the first human spaceflight of Yuri Gagarin through the Mercury, Vostok and Voskhod flights, up to the first space walk by Alexei Leonov.
Voskhod 2 (Russian: Восход-2 )(English: Sunrise-2) was a Soviet manned space mission in March 1965.
 The Vostok-based Voskhod 3KD spacecraft with two crew members on board, Pavel Belyayev and Alexey Leonov, was equipped with an inflatable airlock.
 It established another milestone in space exploration when Alexey Leonov became the first person to leave the spacecraft in a specialized spacesuit to conduct a 12 minute "spacewalk".
Pavel Ivanovich Belyayev (Russian: Павел Иванович Беляев ; 26 June 1925 – 10 January 1970), was a Soviet fighter pilot with extensive experience in piloting different types of aircraft.
 He was the first commander of the cosmonaut corps and the cosmonaut who commanded the historic Voskhod 2 mission which saw the first man walk in space in 1965.

Question: In what year was the pilot that joined Alexey Leonov on a 1965 space walk mission born?
Answer: 1925