The U.S. Defense News cited U.S. Navy news on September 26 that from September 17 to 21, the U.S. Navy successfully tested four non-ballistic headed "Tricolor II" D5 ballistic missiles from a "Ohio" class ballistic missile nuclear submarine in the waters near Florida, and said the test was part of a series of planned testing activities aimed at testing the reliability of the weapons system.

The U.S. Navy said in a statement that ¡°this missile test was not aimed at any international events and the missile ended up falling into the Atlantic Ocean after the launch.¡±

The "Tri-Fortune II" D5 ballistic missile was developed in the 1980s, in 2017 "extended life upgrade" to extend its life to the 1940s "Tri-Fortune" missile can carry the equivalent of 100,000 tons of W76 type divided nuclear warheads or the equivalent of 47.5 million tons of W88 new divided nuclear warheads, effective load of up to 2.8 tons.

The report also said that the United States and Britain deployed the missile on their Ohio and Vanguard nuclear submarines. According to the British Sky News channel website on February 21 last year, in a rare test conducted by a British nuclear submarine, a "three-fork" missile failed to launch and fell into waters near Florida. The British Defense Ministry subsequently confirmed that the "Vanguard" nuclear submarine's participation in the exercise occurred in "an unusual situation". But a spokesman insisted that the nuclear deterrent force as the cornerstone of the British Defense "was still safe, reliable and effective."This was the second "three-fork" missile test failed after a failure in 2016.