NASA March 16, 1966: Gemini's First Docking of Two Spacecraft in Earth Orbit

On March 16, 1966, command pilot Neil Armstrong and pilot David Scott successfully docked their Gemini VIII spacecraft with the Agena target vehicle, the first-ever linking of two spacecraft together in Earth orbit. This crucial spaceflight technology milestone would prove vital to the success of future moon landing missions. via NASA http://www.nasa.gov/image-feature/march-16-1966-geminis-first-docking-of-two-spacecraft-in-earth-orbit