190904-N-N0101-0015 PACIFIC OCEAN (Sept. 4, 2019) An unarmed Trident II D5 missile launches from the Ohio-class ballistic missile submarine USS Nebraska (SSBN 739) off the coast of San Diego, California, Sept. 4, 2019. The test launch was one of four conducted Sept. 4 and Sept. 6 as part of a U.S. Navy Commander Evaluation Test, validating performance expectations of the life-extended Trident II D5 strategic weapon system. These four launches mark 176 successful missile launches of the Trident II D5 strategic weapon system. (U.S. Navy photo/Released)

Between September 4-6, the U.S. Navy test fired four Trident II D5 submarine-launched ballistic missiles (SLBMs) off the coast of California. The tests validated the performance of the life-extended Trident II missile, which was originally designed with a lifespan to 2024. The life-extended missile is expected to be operational through the late 2040s. Entering service in 1990, the Trident II D5 missile system has had 176 successful flight tests flights.

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USS Nebraska Tests Four Trident II D5 Missiles, U.S. Navy