FILE PHOTO: An unarmed Trident II D5 missile is test-launched

    FILE PHOTO: An unarmed Trident II D5 missile is test-launched from the Ohio-class U.S. Navy ballistic missile submarine USS Nebraska off the coast of California, U.S. March 26, 2018. U.S. Navy/Mass Communication Specialist 1st Class Ronald Gutridge/Handout via REUTERS/File Photo