CASTLE SERIES FACT SHEET ORAFT CASTLE was a nuclear weapons test series held at the Atomic Energy Commission's (AEC) Pacific Proving Ground (PPG) in Spring 1954. The PPG consisted of Enewetak and Bikini atolls in the northwestern Marshal] Islands in the Central Pacific Ocean. There were six detonations in the series and they are listed in the following table: Date Magnitude Assigned Name (equivatent Location tons TNT) 1 March BRAVO Bikini; sandspit off Nam Island 15 (MT) 27 March ROMEO Bikini; barge in BRAVO crater 11 (MT) -7 April KOON Bikini; surface of Eneman Island 110 (KT) 26 April UNION Bikini; barge in lagoon off I[roij 5 May YANKEE Bikini; barge in UNION crater 14 May NECTAR Enewetak; barge in MIKE? crater 6.9 (MT) 13.5 (MT) 1.69 (MT) 410.4 MT detonation in 1952. HISTORICAL BACKGROUND The CASTLE series was held for the purpose of testing Jarge-yield thermonuclear weapons. President Truman ordered this development in 1950 r and the work had progressed through the GEORGE experimental shot on GREENHOUSE (1951) and the MIKE shot of IVY (1952). MIKE was the first