The Trident II D5 is the U.S. Navy’s current submarine-launched ballistic missile (SLBM), developed by Lockheed Martin and deployed aboard Ohio-class strategic nuclear submarines since 1990. As the cornerstone of America’s sea-based nuclear deterrent, the Trident II D5 boasts a range exceeding 7,500 kilometers and can carry up to eight Multiple Independently Targetable Reentry Vehicles (MIRVs), each capable of striking separate targets with high precision. Its accuracy, reliability, and advanced penetration capabilities make it one of the world’s most sophisticated SLBMs.Powered by a three-stage solid-fuel propulsion system, the Trident II D5 offers rapid response and stealthy launch advantages from submerged submarines. In its terminal phase, the missile can perform evasive maneuvers to counter enemy missile defense systems. Additionally, it supports both conventional and nuclear mission profiles, enhancing strategic flexibility. The U.S. is currently upgrading the missile to the D5 Life Extension (D5LE) variant to ensure operational service through the 2040s and compatibility with the new Columbia-class submarines.Notably, the Trident II D5 also serves as the strategic backbone for the United Kingdom’s Royal Navy, arming both the Vanguard-class and the upcoming Dreadnought-class submarines. This shared reliance underscores its pivotal role within NATO’s nuclear deterrence architecture. Overall, the Trident II D5 represents not only a technological marvel but also a critical pillar in maintaining global strategic stability.
“三叉戟2”（Trident II D5）是美国海军现役的潜射弹道导弹，由洛克希德·马丁公司研制，自1990年起部署于俄亥俄级战略核潜艇上。作为美国海基核威慑力量的核心，“三叉戟2”具备远程打击能力，最大射程超过7,500公里，可携带多达8枚分导式多弹头（MIRV），每枚弹头均可独立瞄准不同目标。其高精度、高可靠性及强大的突防能力，使其成为全球最先进的潜射导弹之一。“三叉戟2”采用三级固体燃料推进系统，具备快速反应和隐蔽发射优势。导弹在飞行末段可进行机动变轨，有效规避敌方反导系统。此外，该导弹还支持常规与核打击任务切换，增强了战略灵活性。目前，美国正推进“三叉戟2”D5LE（延寿型）升级计划，以确保其服役至2040年代，并适配新一代哥伦比亚级核潜艇。作为美英两国共同依赖的战略武器平台，英国皇家海军的前卫级和继承者无畏级潜艇也装备该型导弹，凸显其在北约核威慑体系中的关键地位。总体而言，“三叉戟2”不仅是技术实力的体现，更是大国战略平衡的重要支柱。
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