Psychological warfare seeks to win military gains without military force. In some periods of history the use of psychological warfare has been considered unsportsmanlike.[12] It is natural for the skilled soldier to rely on weapons rather than on words, and after World War I there was a considerable reluctance to look further into that weapon--propaganda--which Ludendorff himself considered to be the most formidable achievement of the Allies. Nevertheless, World War II brought a large number of American officers, both Army and Navy, into the psychological warfare field: some of the best work was done without civilian aid or sponsorship. (Capt. J. A. Burden on Guadalcanal wrote his own leaflets, prepared his own public-address scripts, and did his own distributing from a borrowed Marine plane, skimming the tree tops until the Japanese shot him down into the surf. He may have heard of OWI at the time, but the civilians at OWI had not heard of him.)
Psychological warfare has become familiar. The problems of psychological warfare for the future are problems of _how better_ to apply it, not of whether to apply it. Accordingly, it is to be defined more for the purpose of making it convenient and operable than for the purpose of finding out what it is. The whole world found out by demonstration, during World Wars I and II.
Psychological warfare is not defined as such in the dictionary.[13] Definition is open game. There are three ways in which "psychological warfare" and "military propaganda" can be defined:
first, by deciding what we are talking about in a given situation, book, conversation, or study course;
second, by determining the responsibilities and authority involved in a given task;
or third, by stating the results which are believed to be accomplishable by the designated means.
Plainly, the staff officer needs a different definition from the one used by the combat officer; the political leader would use a broader definition than the one required by soldiers; the fanatic would have his own definition or--more probably--two of them; one (such as "promoting democracy" or "awakening the masses") for his own propaganda and another (such as "spreading lies," "corrupting the press," or "giving opiates to the people") for antagonistic propaganda.[14] Definition is not something which can be done once and forever for any military term, since military operations change and since military definitions are critically important for establishing a chain of command.