W53 Thermonuclear Bomb Based upon the Mk-53 "hydrogen" bomb, the W53 was modified to be carried by the Titan II Intercontinental Ballistic Missile (ICBM). With a yield in the megaton range, the W53 fit into a Mk-6 re-entry vehicle installed on top of the Titan II. This artifact is on loan courtesy of the National Museum of Nuclear Science & History. Click here to return to the Missile Gallery. Find Out More Related Fact Sheets Martin Marietta SM-68B/LGM-25C Titan II Other Resources National Museum of Nuclear Science & History Note: The appearance of hyperlinks does not constitute endorsement by the National Museum of the USAF, the U.S. Air Force, or the Department of Defense, of the external website, or the information, products or services contained therein.