1969: The first docking of two spacecraft and the first crew exchange in orbit. Two members of Soyuz 5 (Yeliseyev and Khrunov) made an EVA and transfered to Soyuz 4 (commanded by Shatalov) leaving Soyuz 5 Commander Volynov alone. All was not roses and wine in this dual mission: Volynov made a very dangerous reentry when the propulsion mode didn’t separated cleanly, due to that the capsule began its reentry “back to front” with the hatch facing forward. Luckily, it righted later, but it was a brutal reentry and Volynov broke several front teeth in the upper jaw. He was removed from flight status for 2 years.