Core Viewpoint - The U.S. Navy successfully conducted a test of four unarmed Trident II (D5) ballistic missiles from an Ohio-class submarine, aimed at verifying the reliability of the weapon system, with no connection to current international events [1][3]. Group 1: Missile Test Details - The missile test took place from September 17 to 21 in waters near Florida [1][3]. - The Trident II (D5) missile was developed in the 1980s and underwent a life extension upgrade in 2017 to extend its service life into the 2040s [3]. - The missile can carry W76 warheads with a yield of 100 kilotons or W88 warheads with a yield of 475 kilotons, with a maximum payload capacity of 2.8 tons [3]. Group 2: Deployment and Historical Context - Both the U.S. and the U.K. deploy the Trident missile on their Ohio-class and Vanguard-class submarines [3]. - A previous test of the Trident missile by a British submarine resulted in a failure, which was confirmed by the U.K. Ministry of Defence, emphasizing the continued reliability of their nuclear deterrent despite the incident [3].

Core Points - The U.S. Navy successfully tested four unarmed Trident II (D5) ballistic missiles from an Ohio-class submarine between September 17 and 21, aimed at verifying the weapon system's reliability [1][4] - The missile test was part of a planned series of tests and was not conducted in response to any international events [4] - The Trident II (D5) missile, developed in the 1980s, underwent a life extension upgrade in 2017 to extend its service life into the 2040s [4] Missile Specifications - The Trident II (D5) can carry W76 warheads with a yield of 100 kilotons or W88 warheads with a yield of 475 kilotons, with a payload capacity of up to 2.8 tons [4] - Both the U.S. and the U.K. deploy the Trident missile on their Ohio-class and Vanguard-class submarines [5] Previous Incidents - A previous test of the Trident missile by a British submarine resulted in a failure, with the missile crashing into the sea near Florida, marking the second failure since 2016 [5]