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Soviet junior researcher Y.G. Pobrov observes testing of the Apollo-Soyuz docking system at Rockwell International's plant in Downey, California. The United States' Docking System 3 (DS-3) here is being positioned onto the USSR's CA-4 system during a Pin and Socket Alignment Test. DS-5 has been designated as the prime flight article for the joint U.S.-USSR Apollo-Soyuz Test Project (ASTP) docking mission in Earth orbit, scheduled for July 1975.