Like all limitations, these are handicaps only to the person who lacks the courage and resourcefulness to turn them into assets. Propaganda is dependent on politics, even for such front-line requirements as "definition of the enemy," yet intelligent exploitation of political goals yields valuable results. Security is an asset to any army; its price is rarely too high a price to pay for protection, but a selective and flexible censorship can lead to positive advantages. _Media_--that is, the actual instrumentalities by which propaganda is conveyed--are the ordnance of psychological warfare. They limit the performable job but they also make it possible in the first place. And as in any military operation, success depends most of all on proper use of personnel. Each of these merits discussion. The experience drawn upon has, in almost all instances, been that of World War II. As in most other fields, common sense runs a close second to experience as a guide in new methods of struggle. =Political Limitations of Psychological Warfare.= Politics has great influence on the content of psychological warfare. The relationship between two warring states is not one of complete severance; on the contrary, in wartime the relationship becomes abnormal, acute, sensitive. Each belligerent takes a strong interest in the other, in its affairs and weaknesses. During World War II the American armed services, government, and people learned more about the Japanese than they would have in twenty years of peacetime education. Japanese names made news. The purposes and weaknesses of the Japanese became the objects of hatred and--along with the hatred--intense scrutiny. Each warring nation tries to turn the known enemy interest in itself into favorable channels. The propagandists of each country try to give the enemy the news which the enemy wants, while so arranging that news as to create a drop in enemy morale, to develop uncertainty in enemy policies, to set enemy cliques into action against each other. The propagandist sometimes becomes very agitated because he recognizes as a technician propaganda opportunities which national policy prohibits his using. The propagandist who is so intent on his target that he forgets his broader responsibilities can often spoil the entire operation.