Edward Higgins White
On June 3, 1965, White flew into space as pilot of Gemini 4. This was the second trip by astronauts in NASA's Project Gemini. White was able to get out of his spaceship in outer space, an activity called a spacewalk, then get back in and come home. (The Soviet Union had already done that earlier in the same year.) The trip lasted until June 7, 1965.