And I quote:

"The purpose of psychological operations (PSYOP) is to demoralize the enemy by causing dissension and unrest among his ranks, while at the same time convincing the local population to support American troops. PSYOP units also provide continuous analysis of the attitudes and behavior of enemy forces to the tactical commanders in the field, so they can develop, produce and employ propaganda in a successful manner."

Source: [link to www.psywarrior.com]

Unfortunately, the enemy doesn't live in caves... we the people are the enemy of the worldwide military.