Operation PLUMBBOB Weapon-Related Events, 1957 Event Date Type Yield BOLTZMANN 28 May Tower 12 kilotons FRANKLIN 2 June Tower LASSEN 5 June Balloon WILSON 18 June Balloon 10 kilotons PRISCILLA 24 June Balloon 37 kilotons 5 July Balloon 74 kilotons HOOD 0.5 tons DIABLO 15 July Tower 17 kilotons JOHN 19 July Air to air missile about 2 kilotons KEPLER 24 July Tower 10 kilotons OWENS 25 July Balloon STOKES 7 August SHASTA 9.7 kilotons Balloon 19 kilotons 18 August Tower 17 kilotons DOPPLER 23 August Balloon 11 kilotons FRANKLIN PRIME 30 August Balloon SMOKY 31 August Tower 44 kilotons 11 kilotons t 4.7 kilotons GALILEO 2 September Tower WHEELER 6 September Balloon LAPLACE 8 September Balloon FIZEAU 14 September Tower 11 kilotons NEWTON 16 September Balloon 12 kilotons RAINIER 19 September Tunnel WHITNEY 23 September Tower 19 kilotons CHARLESTON 28 September Balloon 12 kilotons 7 October Balloon 8 kilotons MORGAN 4.14.1 140 tons 197 tons 1 kilotons 1.7 kilotons Background and Objectives of Operation PLUMBBOB. Largely a joint AEC/DOD effort, Operation PLUMBBOB was planned as an integral part of the continuing U.S. program for developing the means to conduct nuclear warfare in defense of the Nation. 117 The AEC wanted to test a