Apollo-Soyuz mission marks 40

Former Apollo spacecraft commander Thomas Stafford (L) and his Russian Soyuz 19 counterpart Alexei Leonov pose for a picture at the Museum of Cosmonautics in Moscow, Russia, July 15, 2015

Former Apollo spacecraft commander Thomas Stafford (L) and his Russian Soyuz 19 counterpart Alexei Leonov pose for a picture at the Museum of Cosmonautics in Moscow, Russia, July 15, 2015

REUTERS/Sergei Karpukhin
Former Apollo spacecraft commander Thomas Stafford (L) and his Russian Soyuz 19 counterpart Alexei Leonov pose for a picture at the Museum of Cosmonautics in Moscow, Russia, July 15, 2015

Former Apollo spacecraft commander Thomas Stafford (L) and his Russian Soyuz 19 counterpart Alexei Leonov pose for a picture at the Museum of Cosmonautics in Moscow, Russia, July 15, 2015

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