The Gemini program represented a string of firsts for NASA — the first flight with two astronauts, the first rendezvous in space, the first spacewalk — and Kraft was on duty during many of these historic events. America's first spacewalk happened during the Gemini 4 mission; Kraft, at his console, found that he had to force himself to concentrate on his work, distracted by Ed White's "mesmerizing" descriptions of the Earth below.[34] He could easily understand the euphoria that White felt at the spectacle, yet he also was mindful of the discipline required to keep the flight safe.