World War No. 2 and the year 1940 have wrought fundamental and unforeseen changes in warfare. Neutral, non-belligerent, and warring powers have found themselves faced with a hundred new problems--air power, motorized and mechanized units, new tactics, parachutists, and by no means least, the Fifth Column. In all this change, commmunication remains vital to the participant in war. And propaganda and the protection of military secrets are vital both to participants and to nations near the brink of involvement. Thus a mighty power in the struggle for world domination by nations, forms of government, and ideals, is radio.
    International radio is just now beginning to be evaluated adequately as the powerful though invisible weapon it is. Just as dominance in the air by plane may be the key to victory on land and sea, so the use of the ether waves may be the most potent means for the mastery of the minds and hearts of men, without which no nation or ideal can survive.
    Let us imagine, if we can, the invisible and increasing world-wide host of lightning messengers impressed on carrier waves. A magic which in effect has banished time and space throughout the entire globe. In a minute fraction of a second a mere whisper is audible from the Antipodes to the Arctic and from Cathay to the Caribbean, to one hundred million radio receivers, each capable of listening in to hundreds of messages...

...in the next war, radio will be the secret as well as the invisible weapon...

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