Gemini IV: Inside NASA's First Spacewalk Mission (Photos)

On June 3, 1965, NASA’s Gemini IV, or Gemini 4, launched astronauts Ed White and James McDevitt into space on a mission to perform the first American spacewalk. But four-day mission took years to prepare for. See photos from NASA’s training, launch in our space history gallery here.

THIS IMAGE: On September 10, 1964, the prime crew — made of Edward H. White II, pilot, and James A. McDivitt, command pilot — and backup crew — Frank Borman and James A. Lovell, Jr. — for the Gemini 4 mission surround a Gemini spacecraft model.

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