UGM-133A Trident Ⅱ

摘要

1. Upgrades underway 2. Trident Ⅱ SLBM remains in service 3. SSBN(X) will replace the Ohio class submarines 4. U.S. Navy will arm SSBN(X) with Trident Ⅱs 5. New SLBM will replace Trident Ⅱ 6. USAF and Navy will not develop common missile.