April 17 - Pol Pot proclaims the "Democratic Republic of Kampuchea" in Cambodia and becomes its Prime Minister (1975- 1979).
April 24 - Six Red Army Faction terrorists take over West German embassy in Stockholm, take 11 hostages and demand release of the jailed members of RAF. They shoot embassy's military attaché Lieutenant Colonel Baron Andreas von Mirchbach and Dr. Heinz Hillegart. Shortly before midnight some of their explosives detonate and Swedish police exploit the situation to capture them
July 17 - Apollo-Soyuz Test Project: An American Apollo and a Soviet Soyuz spacecraft dock with each other in orbit marking the first such link-up between spacecraft from the two nations