France
France had its first nuclear weapon test in 1960 in an operation dubbed as “Gerboise Bleue.” It used its own research and they ramped up its development after the Suez Crisis in the late 50′s. It was also meant to maintain its status as a great power, like the United Kingdom. In 1968, it tested its first hydrogen bomb in what it calls “Operation Canopus.” It voluntarily disarmed 175 weapons after the Cold War, though 290 are still active.