UGM-133A Trident Ⅱ

摘要

1. Upgrading continues 2. U.S. Navy will keep Trident Ⅱ SLBM in service through 2042 3. New SSBN will carry Trident Us at first 4. More upgrades will be installed over the years 5. U.S. Navy and Air Force could cooperate more closely on future strategic ballistic missiles.