The USS Tennessee, SSBN - 734, enters the Kings Bay, Georgia, Drydock Refit Facility for a refit ( Navy term for maintenance ). She is an OHIO class Fleet Ballistic missile submarine ( SSBN ) capable of launching 24 Trident D-5 missiles with up to 10 nuclear warheads each with a yield of 370 Kilotons each. The Hiroshima bomb yield was 15 Kilotons of TNT. She is the single most powerful weapons system on the planet. And there are 14 of them.