Communication that is strategically placed, either as advertising or as publicity, to gain public support for a special issue, program, or policy, such as a nation's war effort is called:

Propaganda.

Explanation:

Propaganda is a persuasive message originally planned to influence some audience's way of thinking and behavior. In this way, advertising can be called commercial propaganda. In other cases, such as in the nation's war effort mentioned in the example, we are making reference to political propaganda.