July 17, 1975 – During the Apollo-Soyuz mission, two crews of spacemen – one American, one Soviet – met in Earth orbit, helping to thaw out the Cold War. To commemorate the occasion, the American commander Tom Stafford and his Soviet counterpart Alexey Leonov, each brought half of a special mission coin. After two spacecraft docked with each other, the commanders joined the two halves together with a camera present to capture the moment.