`` northwestern slopes of mount etna in sicily ... decca navigational aid transmitting on ... full moon period ... between midnight and 0100 g.m.t ... individual quarter-ton consignments packed in one-foot-thick foam rubber ... minimum of three parachutes per consignment ... nature of planes and flight schedule to be communicated on the 16-megacycle waveband not later than 24 hours before the operation ... any counter-measures initiated will be considered a breach of contract and will result in the detonation of atomic weapon no .