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The sign accompanying the Gemini 4 hatch. It reads

Gemini 4 Spacecraft Hatch

Edward H. White left the Gemini 4 spacecraft through this hatch, June 3, 1965. He was the first American to walk in space. This first Extra Vehicular Activity, or EVA, was a critical step on the way to the Moon.

On Loan: National Air and Space Museum

Despite what the sign says, the hatch through which Ed White traveled to perform the first EVA was still attached to Gemini 4 at the Smithsonian the entire time this hatch was displayed at the Cradle of Aviation: The pilot (who performed the EVA) sat on the starboard side of the spacecraft, while the command pilot sat on the port side. The command pilot's hatch remained closed throughout the mission.