Mark 21 nuclear bomb
The Mark 21 nuclear bomb was a United States nuclear gravity bomb first produced in 1955. It was based on the TX-21 "Shrimp" prototype that had been detonated during the Castle Bravo test in March 1954. While most of the Operation Castle tests were intended to evaluate weapons intended for immediate stockpile, or which were already available for use as part of the Emergency Capability Program, Castle Bravo was intended to test a design which would drastically reduce the size and costs of the first generation of air-droppable atomic weapons (the Mk 14, Mk 17 & Mk 24). At long, in diameter, and weighing , the Mk-21 was half the length and one-third the weight of the Mk-17/24 weapons it replaced. Its minimum yield was specified at four megatons.
Lijon Eknilang
Eknilang traveled extensively throughout the United States and Europe to draw attention to the health problems experienced by Rongelap's residents due to Castle Bravo. She has been called an "icon in the Marshall Islands for her international advocacy on behalf of nuclear test victims." Eknilang spoke on behalf of the former residents of Rongelap before the United States Congress. She also spoke before the Advisory Proceedings on the Legality of the Threat or Use of Nuclear Weapons at the International Court of Justice in The Hague in November 1995.