据环球网，美国《防务新闻》26日援引美国海军消息称，9月17日至21日，美海军在佛罗里达州附近海 域从一艘"俄亥俄"级弹道导弹核潜艇上成功试射四枚未携带弹头的"三叉戟Ⅱ"D5弹道导弹，并称此次试 射属于按计划开展的系列测试活动，旨在检验该武器系统的可靠性。 美海军发布消息称，"此次导弹测 试并非针对任何国际时事而实施。"导弹发射后最终落入大西洋海域。 报道介绍，"三叉戟Ⅱ"D5弹道导 弹研发于20世纪80年代，于2017年进行"延寿升级"以将其寿命延长至21世纪40年代。"三叉戟"导弹可携 带当量为10万吨的W76型分导式核弹头或当量为47.5万吨的W88新型分导式核弹头，有效载荷可达2.8 吨。 ...

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].