Operation: Powder Keg was a military missile exercise to test an experimental nuclear missile under the command of General Bryan of the U. S. Air force. The missile was equipped with an explosive equipped to devastate everything in a 100 mile radius of the missile. However, problems with the explosive lead to it to be removed for just a practical test of the missile's fight capacity, a fact not revealed in missile reports. The missile actually touches down near the island with the castaways. The Professor gets a brief look at its circuitry before the missile takes off out to sea with Gilligan inside and getting lost off shore.
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