In 1994 , a 1953 '' Castle Bravo '' program prospectus was found which included reference to Project 4.1 apparently written before the '' Bravo '' shot had occurred . The U.S. government responded that someone had gone back into the project list after the '' Bravo '' test to insert Project 4.1 ; thus , according to the U.S. government , the acts were not premeditated . All other U.S. documents point to Project 4.1 having been established after the '' Bravo '' test — most sources point to its having been organized on March 7 , 1954 . The final Project 4.1 report began in its preface with the statement that " Operation CASTLE did not include a biomedical program " ( it mentions this in discussing the ad hoc nature by which the project personnel were assembled ) . All official and mainstream historical accounts of the '' Bravo '' test indicate that its high level of fallout was a result of a miscalculation in relation to its design and was not deliberate ( see the Castle Bravo article for more information on the alleged accident )
Castle Bravo
Castle Bravo
Project 4.1