Cosmonauts

Soviet Union

Alexei Leonov — the first person to perform a spacewalk, during Voskhod 2.

Russia

Gennady Padalka — a cosmonaut who commanded several ISS expeditions and holds the record for the most cumulative time spent in space.

Russia

Sergei Krikalev — a veteran cosmonaut who flew on Mir, the Space Shuttle, and the ISS, and was a member of the first ISS expedition crew.

Soviet Union

Valentina Tereshkova — the first woman to fly in space, aboard Vostok 6.

Soviet Union

Yuri Gagarin — the first human to journey into outer space and orbit the Earth, aboard Vostok 1.