B53 nuclear bomb
…disassembled on 25 October 2011, a year ahead of schedule. With its retirement, the most powerful bomb in service in the U.S. nuclear arsenal became the B83, with a maximum yield of 1.2 megatons. The B53 was replaced in the bunker-busting role by the B61 Mod 11. Development of the weapon began in 1955 by…