December 13th, 1979 (, Kang Xi October 24), the United States successfully tested the Trident I missiles.

1979 12 13, 2009, the U.S. Navy successfully launched a Trident I missile. The missile (TodayinHistory.cn) by 50 nautical miles from the coast of Cape Canaveral, "Marino Vallejo nuclear submarine underwater launch. The power of the Trident I missile range greatly exceeds Poseidon and Polaris missiles. It can hit 7400 km to 11,100 km away goals (lssjt.cn) submarine-launched missiles that can reach the goal of the Soviet Union.